Patent Publication Number: US-11660558-B2

Title: Filter cartridges; air cleaner assemblies; housings; features; components; and, methods

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a Continuation of U.S. application Ser. No. 16/674,760, filed Nov. 5, 2019. U.S. application Ser. No. 16/674,760 is a continuation of U.S. application Ser. No. 15/541,122, filed Jun. 30, 2017, now U.S. Pat. No. 10,512,868, which is a National Stage Application of PCT/US2016/020506, filed Mar. 2, 2016, which claims benefit of U.S. provisional application 62/127,166, filed Mar. 2, 2015 and U.S. provisional application 62/188,861, filed Jul. 6, 2015. The complete disclosures of U.S. Ser. No. 16/674,760; U.S. Ser. No. 15/541,122, PCT/US2016/020506, U.S. 62/127,166, and 62/188,861 are incorporated herein by reference. To the extent appropriate, a claim of priority is made to each of U.S. Ser. No. 16/674,760; U.S. Ser. No. 15/541,122, PCT/US2016/020506, U.S. 62/127,166, and 62/188,861. 
    
    
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to filter arrangements, typically for use in filtering air; such as intake air for internal combustion engines. The disclosure particularly relates to filter arrangements that use cartridges having opposite flow ends. Air cleaner arrangements and features; and, methods of assembly and use, are also described. 
     BACKGROUND 
     Air streams can carry contaminant material such as dust and liquid particulate therein. In many instances, it is desired to filter some or all of the contaminant material from the air stream. For example, air flow streams to engines (for example combustion air streams) for motorized vehicles or for power generation equipment, gas streams to gas turbine systems and air streams to various combustion furnaces, carry particulate contaminant therein that should be filtered. It is preferred, for such systems, that selected contaminant material be removed from (or have its level reduced in) the air. A variety of air filter arrangements have been developed for contaminant removal. Improvements are sought. 
     SUMMARY 
     According to the present disclosure, air cleaner assemblies, housings, serviceable filter cartridges and features, components, and methods, relating thereto are disclosed. In general, the features relate to systems that are configured to prevent an improper cartridge from appearing to be properly nested in an air cleaner housing, during servicing. A variety of approaches are described herein, that can be used independently or together to achieve a desired result. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a fragmentary, schematic, perspective view of a first example media type useable in arrangements according to the present disclosure. 
         FIG.  2    is an enlarged, schematic, cross-sectional view of a portion of the media type depicted in  FIG.  1   . 
         FIG.  3    includes schematic views of examples of various fluted media definitions, for media of the type of  FIGS.  1  and  2   . 
         FIG.  4    is a schematic view of an example process for manufacturing media of the type of  FIGS.  1 - 3   . 
         FIG.  5    is a schematic cross-sectional view of an optional end dart for media flutes of the type of  FIGS.  1 - 4   . 
         FIG.  6    is a schematic perspective view of a coiled filter arrangement usable in a filter cartridge having features in accord with the present disclosure, and made with a strip of media for example in accord with  FIG.  1   . 
         FIG.  7    is a schematic perspective view of a stacked media pack arrangement usable in a filter arrangement having features in accord with the present disclosure and made with a strip of media for example in accord with  FIG.  1   . 
         FIG.  8    is a schematic flow end view of a filter media pack using an alternate media to the media of  FIG.  1   , and alternately usable in selected filter cartridges in accord with the present disclosure. 
         FIG.  8 A  is a schematic opposite flow end view to the view of  FIG.  8   . 
         FIG.  8 B  is a schematic cross-sectional view of the media pack of  FIGS.  8  and  8 A . 
         FIG.  9    is a schematic, fragmentary, cross-sectional view of a further alternate media type usable in a media pack of a filter cartridge having features in accord with the present disclosure. 
         FIG.  10    is a schematic, fragmentary cross-sectional view, of a first variation of the media type of  FIG.  9   . 
         FIG.  11 A  is a schematic depiction of another usable fluted sheet/facing sheet combination in accord with the present disclosure. 
         FIG.  11 B  is a second schematic view of the type of media in  FIG.  11 A . 
         FIG.  11 C  is a schematic, fragmentary, plan view of still another variation of the media. 
         FIG.  12    is a schematic view of another variation of usable media in accord with the present disclosure. 
         FIG.  13    is a schematic, top, perspective view of an air cleaner assembly including features and components in accord with the present disclosure. 
         FIG.  14    is a schematic, perspective, view of the air cleaner assembly of  FIG.  13   , with a housing section removed, and an evacuator valve component shown in exploded view. 
         FIG.  15    is a schematic, perspective, view of a filter cartridge component installable in the air cleaner assembly of  FIGS.  13  and  14   . 
         FIG.  16    is a schematic, enlarged, fragmentary, perspective view of a portion of the filter cartridge depicted in  FIG.  15   . 
         FIG.  17    is a second schematic perspective view of a filter cartridge of  FIG.  15   ; the view of  FIG.  17    being toward an opposite end of the cartridge than the view of  FIG.  15   . 
         FIG.  18    is a schematic enlarged fragmentary view of a portion of the filter cartridge of  FIG.  17   . 
         FIG.  19    is a schematic perspective view of a housing component of the air cleaner assembly of  FIG.  13   . 
         FIG.  20    is a second schematic perspective view of the housing component of  FIG.  19   . 
         FIG.  21    is a schematic, enlarged, fragmentary, perspective view of an end portion of the housing component of  FIG.  20   . 
         FIG.  22    is a schematic top perspective view of a second housing section component of an air cleaner housing of the assembly of  FIG.  13   . 
         FIG.  23    is a schematic, second, perspective view of the housing section of  FIG.  22   , taken toward the inside thereof. 
         FIG.  24    is a schematic, enlarged, fragmentary, perspective view of a portion of the housing section of  FIG.  23   , taken toward an interior portion thereof. 
         FIG.  25    is a schematic, enlarged, fragmentary, perspective view of an exterior portion of the cover section of  FIG.  22   . 
         FIG.  26    is a schematic, perspective, cross-sectional view of the filter cartridge component of  FIG.  15   , taken generally along line  26 - 26  thereof.  FIG.  27    is an enlarged, schematic, fragmentary, view of a portion of  FIG.  26   . 
         FIG.  28    is a schematic, fragmentary, cross-sectional view of a portion of the air cleaner assembly of  FIG.  13   ;  FIG.  28    being taken generally along line  28 - 28 ,  FIG.  13   . 
         FIG.  29    is an enlarged, schematic, fragmentary, cross-sectional view of a portion of the air cleaner assembly of  FIG.  13   . 
         FIG.  30    is an enlarged, schematic, fragmentary view of a portion of  FIG.  29   ; 
       taken generally along line  30 - 30 ,  FIG.  13   . 
         FIG.  31    is a second schematic cross-sectional view of a portion of the filter cartridge of  FIG.  15   ;  FIG.  31    being taken generally along line  31 - 31 ,  FIG.  13   . 
         FIG.  32    is an enlarged, fragmentary, schematic view of a portion of  FIG.  31   . 
         FIG.  33    is an enlarged fragmentary cross-sectional view of the assembly of  FIG.  13   ;  FIG.  33    being taken generally along line  33 - 33 ,  FIG.  13   . 
         FIG.  34    is a second, fragmentary, enlarged, schematic, cross-sectional view of the air cleaner assembly of  FIG.  13   , taken generally along line  34 - 34 ,  FIG.  13   , but from a different perspective, than  FIG.  33   . 
         FIG.  35    is an enlarged, fragmentary, schematic, perspective view analogous to  FIG.  34   , but from a different perspective;  FIG.  35    being taken along  35 - 35 ,  FIG.  13   . 
         FIG.  36    is a schematic, enlarged, fragmentary, perspective view of a molded component of a filter cartridge of  FIG.  15   . 
         FIG.  37    is a second, enlarged, schematic, fragmentary perspective view of the molded component of  FIG.  36   . 
         FIG.  38    is an enlarged, schematic, fragmentary cross-sectional view of a portion of the air cleaner assembly of  FIG.  13   ;  FIG.  35    being taken along line  38 - 38 ,  FIG.  13   . 
         FIG.  39    is an enlarged, schematic, fragmentary cross-sectional end perspective of the portion of the assembly depicted in  FIG.  38   . 
         FIG.  40    is a schematic enlarged fragmentary cross-sectional view of a portion of the air cleaner assembly of  FIG.  13   ;  FIG.  40    being taken generally along the place  40 - 40  indicated in  FIG.  39   . 
         FIG.  41    is a schematic perspective view of an alternate filter cartridge embodying principles according to the present disclosure. 
         FIG.  42    is a schematic side elevational view of the filter cartridge of  FIG.  41   . 
         FIG.  43    is a schematic enlarged fragmentary view of an identified portion of  FIG.  42   . 
         FIG.  44    is an enlarged, schematic, fragmentary view of a filter cartridge generally in accord with  FIG.  15   , but including alternate specific features thereon. 
         FIG.  45    is a schematic fragmentary view toward an opposite end of the filter cartridge toward  FIG.  44   . 
         FIG.  46    is a top perspective view of an alternate air cleaner assembly to the air cleaner assembly of  FIG.  13   . 
         FIG.  47    is a schematic perspective view of the air cleaner assembly of  FIG.  45    with a housing component removed. 
         FIG.  48    is a schematic perspective view of a filter cartridge component of the air cleaner assembly of  FIGS.  46  and  47   . 
         FIG.  49    is a schematic, enlarged, fragmentary, perspective view of a portion of the filter cartridge of  FIG.  48   . 
         FIG.  50    is a schematic, enlarged, fragmentary, perspective view of an identified portion of the cartridge of  FIGS.  48  and  49   , taken toward an opposite end of the cartridge. 
         FIG.  51    is a schematic perspective view of the portion of the filter cartridge depicted in  FIG.  49    from a different perspective and still toward the same end of the cartridge. 
         FIG.  52    is a fragmentary, schematic, plan view of the portion of the filter cartridge depicted in  FIG.  51   . 
         FIG.  53    is a schematic, cross-sectional view of the filter cartridge depicted in  FIG.  48   . 
         FIG.  54    is an enlarged, schematic, fragmentary cross-sectional view taken in the same plane as  FIG.  53   , but depicting the cartridge from a different perspective. 
         FIG.  55    is a second fragmentary cross-sectional view taken from a similar perspective to  FIG.  54   , but with a cross-sectional plane at a different location. 
         FIG.  56    is an enlarged fragmentary, perspective view of a selected portion of a housing seal engagement portion of the filter cartridge of  FIG.  48   . 
         FIG.  57    is a schematic, perspective, view of the portion of the housing engagement arrangement of  FIG.  56   , depicted from a different perspective. 
         FIG.  58    is an enlarged, fragmentary, cross-sectional view of a portion of the component of  FIG.  57   . 
         FIG.  59    is a schematic, perspective view of a housing section of the air cleaner assembly of  FIG.  46   . 
         FIG.  60    is an enlarged fragmentary perspective view taken toward an inside portion of the housing component of  FIG.  59   . 
         FIG.  61    is an enlarged fragmentary plan view taken toward the housing component of  FIG.  60   . 
         FIG.  62    is a fragmentary outside plan view taken toward a side of the housing component of  FIG.  61   . 
         FIG.  63    is a fragmentary perspective view toward a portion of the housing component depicted in  FIG.  62   . 
         FIG.  64    is a schematic depiction of another usable fluted sheet/facing sheet combination in accord with the present disclosure. 
         FIG.  65    is a perspective view of a portion of the usable fluted sheet/facing sheet combination depicted in  FIG.  64   . 
     
    
    
     DETAILED DESCRIPTION 
     I. Example Media Configurations, Generally 
     Principles according to the present disclosure relate to interactions between filter cartridges and air cleaner systems, in advantageous manners to achieve certain, selected, desired results discussed below. The filter cartridge would generally include a filter media therein, through which air and other gases pass, during a filtering operation. The media can be of a variety of types and configurations, and can be made from using a variety of materials. For example, pleated media arrangements can be used in cartridges according to the principles of the present disclosure, as discussed below. 
     The principles are particularly well adapted for use in situations in which the media is quite deep in extension between the inlet and outlet ends of the cartridge, but alternatives are possible. Also, the principles are often used in cartridges that relatively large cross-dimension sizes. With such arrangements, alternate media types to pleated media will often be desired. 
     In this section, examples of some media arrangements that are usable with the techniques described herein are provided. It will be understood, however, that a variety of alternate media types can be used. The choice of media type is generally one of preference for: availability; function in a given situation of application, ease of manufacturability, etc. and the choice is not necessarily specifically related to the overall function of selected ones of various filter cartridge/air cleaner interaction features characterized herein. 
     A. Media Pack Arrangements Using Filter Media Having Media Ridges (Flutes) Secured to Facing Media 
     Fluted filter media (media having media ridges) can be used to provide fluid filter constructions in a variety of manners. One well known manner is characterized herein as a z-filter construction. The term “z-filter construction” as used herein, is meant to include (but not be limited) a type of filter construction in which individual ones of corrugated, folded or otherwise formed filter flutes are used to define (typically in combination with facing media) sets of longitudinal, typically parallel, inlet and outlet filter flutes for fluid flow through the media. Some examples of z-filter media are provided in U.S. Pat. Nos. 5,820,646; 5,772,883; 5,902,364; 5,792,247; 5,895,574; 6,210,469; 6,190,432; 6,350,296; 6,179,890; 6,235,195; Des. 399,944; Des. 428,128; Des. 396,098; Des. 398,046; and, Des. 437,401; each of these cited references being incorporated herein by reference. 
     One type of z-filter media, utilizes two specific media components joined together, to form the media construction. The two components are: (1) a fluted (typically corrugated) media sheet or sheet section, and, (2) a facing media sheet or sheet section. The facing media sheet is typically non-corrugated, however it can be corrugated, for example perpendicularly to the flute direction as described in U.S. provisional 60/543,804, filed Feb. 11, 2004, and published as PCT WO 05/077487 on Aug. 25, 2005, incorporated herein by reference. 
     The fluted media section and facing media section can comprise separate materials between one another. However, they can also be sections of the single media sheet folded to bring the facing media material into appropriate juxtaposition with the fluted media portion of the media. 
     The fluted (typically corrugated) media sheet and the facing media sheet or sheet section together, are typically used to define media having parallel flutes. In some instances, the fluted sheet and facing sheet are separate and then secured together and are then coiled, as a media strip, to form a z-filter media construction. Such arrangements are described, for example, in U.S. Pat. Nos. 6,235,195 and 6,179,890, each of which is incorporated herein by reference. In certain other arrangements, some non-coiled sections or strips of fluted (typically corrugated) media secured to facing media, are stacked with one another, to create a filter construction. An example of this is described in FIG. 11 of U.S. Pat. No. 5,820,646, incorporated herein by reference. 
     Herein, strips of material comprising fluted sheet (sheet of media with ridges) secured to corrugated sheet, which are then assembled into stacks to form media packs, are sometimes referred to as “single facer strips,” “single faced strips,” or as “single facer” or “single faced” media. The terms and variants thereof, are meant to refer to a fact that one face, i.e., a single face, of the fluted (typically corrugated) sheet is faced by the facing sheet, in each strip. 
     Typically, coiling of a strip of the fluted sheet/facing sheet (i.e., single facer) combination around itself, to create a coiled media pack, is conducted with the facing sheet directed outwardly. Some techniques for coiling are described in U.S. provisional application 60/467,521, filed May 2, 2003 and PCT Application US 04/07927, filed Mar. 17, 2004, now published as WO 04/082795, each of which is incorporated herein by reference. The resulting coiled arrangement generally has, as the outer surface of the media pack, a portion of the facing sheet, as a result. 
     The term “corrugated” used herein to refer to structure in media, is often used to refer to a flute structure resulting from passing the media between two corrugation rollers, i.e., into a nip or bite between two rollers, each of which has surface features appropriate to cause corrugations in the resulting media. The term “corrugation” is however, not meant to be limited to such flutes, unless it is stated that they result from flutes that are by techniques involving passage of media into a bite between corrugation rollers. The term “corrugated” is meant to apply even if the media is further modified or deformed after corrugation, for example by the folding techniques described in PCT WO 04/007054, and published Jan. 22, 2004, incorporated herein by reference. 
     Corrugated media is a specific form of fluted media. Fluted media is media which has individual flutes or ridges (for example formed by corrugating or folding) extending thereacross. 
     Serviceable filter element or filter cartridge configurations utilizing z-filter media are sometimes referred to as “straight through flow configurations” or by variants thereof. In general, in this context what is meant is that the serviceable filter elements or cartridges generally have an inlet flow end (or face) and an opposite exit flow end (or face), with flow entering and exiting the filter cartridge in generally the same straight through direction. The term “serviceable” in this context is meant to refer to a media containing filter cartridge that is periodically removed and replaced from a corresponding fluid (e.g. air) cleaner. In some instances, each of the inlet flow end (or face) and outlet flow end (or face) will be generally flat or planar, with the two parallel to one another. However, variations from this, for example non-planar faces, are possible. 
     A straight through flow configuration (especially for a coiled or stacked media pack) is, for example, in contrast to serviceable filter cartridges such as cylindrical pleated filter cartridges of the type shown in U.S. Pat. No. 6,039,778, incorporated herein by reference, in which the flow generally makes a substantial turn as its passes into and out of the media. That is, in a U.S. Pat. No. 6,039,778 filter, the flow enters the cylindrical filter cartridge through a cylindrical side, and then turns to exit through an open end of the media (in forward-flow systems). In a typical reverse-flow system, the flow enters the serviceable cylindrical cartridge through an open end of the media and then turns to exit through a side of the cylindrical filter media. An example of such a reverse-flow system is shown in U.S. Pat. No. 5,613,992, incorporated by reference herein. The term “z-filter media construction” and variants thereof as used herein, without more, is meant to include, but not necessarily be limited to, any or all of: a web of corrugated or otherwise fluted media (media having media ridges) secured to (facing) media, whether the sheets are separate or part of a single web, with appropriate sealing (closure) to allow for definition of inlet and outlet flutes; and/or a media pack constructed or formed from such media into a three dimensional network of inlet and outlet flutes; and/or, a filter cartridge or construction including such a media pack. 
     In  FIG.  1   , an example of media  1  useable in z-filter media construction is shown. The media  1  is formed from a fluted, in this instance corrugated, sheet  3  and a facing sheet  4 . A construction such as media  1  is referred to herein as a single facer or single faced strip. 
     Sometimes, the corrugated fluted or ridged sheet  3 ,  FIG.  1   , is of a type generally characterized herein as having a regular, curved, wave pattern of flutes, ridges or corrugations  7 . The term “wave pattern” in this context, is meant to refer to a flute, ridge or corrugated pattern of alternating troughs  7   b  and ridges  7   a . The term “regular” in this context is meant to refer to the fact that the pairs of troughs and ridges ( 7   b ,  7   a ) alternate with generally the same repeating corrugation (flute or ridge) shape and size. (Also, typically in a regular configuration each trough  7   b  is substantially an inverse ridge for each ridge  7   a .) The term “regular” is thus meant to indicate that the corrugation (or flute) pattern comprises troughs (inverted ridges) and ridges with each pair (comprising an adjacent trough and ridge) repeating, without substantial modification in size and shape of the corrugations along at least 70% of the length of the flutes. The term “substantial” in this context, refers to a modification resulting from a change in the process or form used to create the corrugated or fluted sheet, as opposed to minor variations from the fact that the media sheet  3  is flexible. With respect to the characterization of a repeating pattern, it is not meant that in any given filter construction, an equal number of ridges and troughs is necessarily present. The media  1  could be terminated, for example, between a pair comprising a ridge and a trough, or partially along a pair comprising a ridge and a trough. (For example, in  FIG.  1    the media  1  depicted in fragmentary has eight complete ridges  7   a  and seven complete troughs  7   b .) Also, the opposite flute ends (ends of the troughs and ridges) may vary from one another. Such variations in ends are disregarded in these definitions, unless specifically stated. That is, variations in the ends of flutes are intended to be covered by the above definitions. 
     In the context of the characterization of a “curved” wave pattern of corrugations, in certain instances the corrugation pattern is not the result of a folded or creased shape provided to the media, but rather the apex  7   a  of each ridge and the bottom  7   b  of each trough is formed along a radiused curve. A typical radius for such z-filter media would be at least 0.25 mm and typically would be not more than 3 mm. 
     An additional characteristic of the particular regular, curved, wave pattern depicted in  FIG.  1   , for the corrugated sheet  3 , is that at approximately a midpoint  30  between each trough and each adjacent ridge, along most of the length of the flutes  7 , is located a transition region where the curvature inverts. For example, viewing back side or face  3   a ,  FIG.  1   , trough  7   b  is a concave region, and ridge  7   a  is a convex region. Of course when viewed toward front side or face  3   b , trough  7   b  of side  3   a  forms a ridge; and, ridge  7   a  of face  3   a , forms a trough. (In some instances, region  30  can be a straight segment, instead of a point, with curvature inverting at ends of the segment  30 .) 
     A characteristic of the particular regular, wave pattern fluted (in this instance corrugated) sheet  3  shown in  FIG.  1   , is that the individual corrugations, ridges or flutes are generally straight, although alternatives are possible. By “straight” in this context, it is meant that through at least 70%, typically at least 80% of the length, the ridges  7   a  and troughs (or inverted ridges)  7   b  do not change substantially in cross-section. The term “straight” in reference to corrugation pattern shown in  FIG.  1   , in part distinguishes the pattern from the tapered flutes of corrugated media described in FIG. 1 of WO 97/40918 and PCT Publication WO 03/47722, published Jun. 12, 2003, incorporated herein by reference. The tapered flutes of FIG. 1 of WO 97/40918, for example, would be a curved wave pattern, but not a “regular” pattern, or a pattern of straight flutes, as the terms are used herein. 
     Referring to the present  FIG.  1    and as referenced above, the media  1  has first and second opposite edges  8  and  9 . When the media  1  is formed into a media pack, in general edge  9  will form an inlet end or face for the media pack and edge  8  an outlet end or face, although an opposite orientation is possible. 
     In the example depicted, the various flutes  7  extend completely between the opposite edges  8 ,  9 , but alternatives are possible. For example, they can extend to a location adjacent or near the edges, but not completely therethrough. Also, they can be stopped and started partway through the media, as for example in the media of US 2014/0208705 A1, incorporated herein by reference. 
     When the media is as depicted in  FIG.  1   , adjacent edge  8  can provided a sealant bead  10 , sealing the corrugated sheet  3  and the facing sheet  4  together. Bead  10  will sometimes be referred to as a “single facer” or “single face” bead, or by variants, since it is a bead between the corrugated sheet  3  and facing sheet  4 , which forms the single facer (single faced) media strip  1 . Sealant bead  10  seals closed individual flutes  11  adjacent edge  8 , to passage of air therefrom (or thereto in an opposite flow). 
     In the media depicted in  FIG.  1   , adjacent edge  9  is provided seal bead  14 . Seal bead  14  generally closes flutes  15  to passage of unfiltered fluid therefrom (or flow therein in an opposite flow), adjacent edge  9 . Bead  14  would typically be applied as media  1  is configured into a media pack. If the media pack is made from a stack of strips  1 , bead  14  will form a seal between a back side  17  of facing sheet  4 , and side  18  of the next adjacent corrugated sheet  3 . When the media  1  is cut in strips and stacked, instead of coiled, bead  14  is referenced as a “stacking bead.” (When bead  14  is used in a coiled arrangement formed from a long strip of media  1 , it may be referenced as a “winding bead.”). 
     In alternate types of through-flow media, seal material can be located differently, and added sealant or adhesive can even be avoided. For example, in some instances, the media can be folded to form an end or edge seam; or, the media can be sealed closed by alternate techniques such as ultrasound application, etc. Further, even when sealant material is used, it need not be adjacent opposite ends. 
     Referring to  FIG.  1   , once the filter media  1  is incorporated into a media pack, for example by stacking or coiling, it can be operated as follows. First, air in the direction of arrows  12 , would enter open flutes  11  adjacent end  9 . Due to the closure at end  8 , by bead  10 , the air would pass through the filter media  1 , for example as shown by arrows  13 . It could then exit the media or media pack, by passage through open ends  15   a  of the flutes  15 , adjacent end  8  of the media pack. Of course operation could be conducted with air flow in the opposite direction. 
     For the particular arrangement shown herein in  FIG.  1   , the parallel corrugations  7   a ,  7   b  are generally straight completely across the media, from edge  8  to edge  9 . Straight flutes, ridges or corrugations can be deformed or folded at selected locations, especially at ends. Modifications at flute ends for closure are generally disregarded in the above definitions of “regular,” “curved” and “wave pattern.” 
     Z-filter constructions which do not utilize straight, regular curved wave pattern corrugation shapes are known. For example in Yamada et al. U.S. Pat. No. 5,562,825 corrugation patterns which utilize somewhat semicircular (in cross section) inlet flutes adjacent narrow V-shaped (with curved sides) exit flutes are shown (see FIGS. 1 and 3, of U.S. Pat. No. 5,562,825). In Matsumoto, et al. U.S. Pat. No. 5,049,326 circular (in cross-section) or tubular flutes defined by one sheet having half tubes attached to another sheet having half tubes, with flat regions between the resulting parallel, straight, flutes are shown, see FIG. 2 of Matsumoto &#39;326. In Ishii, et al. U.S. Pat. No. 4,925,561 (FIG. 1) flutes folded to have a rectangular cross section are shown, in which the flutes taper along their lengths. In WO 97/40918 (FIG. 1), flutes or parallel corrugations which have a curved, wave patterns (from adjacent curved convex and concave troughs) but which taper along their lengths (and thus are not straight) are shown. Also, in WO 97/40918 flutes which have curved wave patterns, but with different sized ridges and troughs, are shown. Also, flutes which are modified in shape to include various ridges are known. 
     In general, the filter media is a relatively flexible material, typically a non-woven fibrous material (of cellulose fibers, synthetic fibers or both) often including a resin therein, sometimes treated with additional materials. Thus, it can be conformed or configured into the various corrugated patterns, without unacceptable media damage. Also, it can be readily coiled or otherwise configured for use, again without unacceptable media damage. Of course, it must be of a nature such that it will maintain the required corrugated configuration, during use. 
     Typically, in the corrugation process, an inelastic deformation is caused to the media. This prevents the media from returning to its original shape. However, once the tension is released the flute or corrugations will tend to spring back, recovering only a portion of the stretch and bending that has occurred. The facing media sheet is sometimes tacked to the fluted media sheet, to inhibit this spring back in the corrugated sheet. Such tacking is shown at  20 . 
     Also, typically, the media contains a resin. During the corrugation process, the media can be heated to above the glass transition point of the resin. When the resin then cools, it will help to maintain the fluted shapes. 
     The media of the corrugated (fluted) sheet  3  facing sheet  4  or both, can be provided with a fine fiber material on one or both sides thereof, for example in accord with U.S. Pat. No. 6,673,136, incorporated herein by reference. In some instances, when such fine fiber material is used, it may be desirable to provide the fine fiber on the upstream side of the material and inside the flutes. When this occurs, air flow, during filtering, will typically be into the edge comprising the stacking bead. 
     An issue with respect to z-filter constructions relates to closing of the individual flute ends. Although alternatives are possible, typically a sealant or adhesive is provided, to accomplish the closure. As is apparent from the discussion above, in typical z-filter media especially that which uses straight flutes as opposed to tapered flutes and sealant for flute seals, large sealant surface areas (and volume) at both the upstream end and the downstream end are needed. High quality seals at these locations are important to proper operation of the media structure that results. The high sealant volume and area, creates issues with respect to this. 
     Attention is now directed to  FIG.  2   , in which z-filter media; i.e., a z-filter media construction  40 , utilizing a regular, curved, wave pattern corrugated sheet  43 , and a non-corrugated flat sheet  44 , i.e., a single facer strip is schematically depicted. The distance D 1 , between points  50  and  51 , defines the extension of flat media  44  in region  52  underneath a given corrugated flute  53 . The length D 2  of the arcuate media for the corrugated flute  53 , over the same distance D 1  is of course larger than D 1 , due to the shape of the corrugated flute  53 . For a typical regular shaped media used in fluted filter applications, the linear length D 2  of the media  53  between points  50  and  51  will often be at least 1.2 times D 1 . Typically, D 2  would be within a range of 1.2-2.0 times D 1 , inclusive. One particularly convenient arrangement for air filters has a configuration in which D 2  is about 1.25-1.35×D 1 . Such media has, for example, been used commercially in Donaldson Powercore™ Z-filter arrangements. Another potentially convenient size would be one in which D 2  is about 1.4-1.6 times D 1 . Herein the ratio D 2 /D 1  will sometimes be characterized as the flute/flat ratio or media draw for the corrugated media. 
     In the corrugated cardboard industry, various standard flutes have been defined. For example the standard E flute, standard X flute, standard B flute, standard C flute and standard A flute.  FIG.  3   , attached, in combination with Table A below provides definitions of these flutes. 
     Donaldson Company, Inc., (DCI) the assignee of the present disclosure, has used variations of the standard A and standard B flutes, in a variety of z-filter arrangements. These flutes are also defined in Table A and  FIG.  3   . 
     
       
         
           
               
             
               
                 TABLE A 
               
               
                   
               
               
                 (Flute definitions for FIG. 3) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                 DCI A Flute: 
                 Flute/flat = 1.52:1; The Radii (R) are as follows: 
               
               
                   
                 R100 = .0675 inch (1.715 mm); R1001 = .0581 inch (1.476 mm); 
               
               
                   
                 R1002 = .0575 inch (1.461 mm); R1003 = .0681 inch (1.730 mm); 
               
               
                 DCI B Flute: 
                 Flute/flat = 1.32:1; The Radii (R) are as follows: 
               
               
                   
                 R1004 = .0600 inch (1.524 mm); R1005 = .0520 inch (1.321 mm); 
               
               
                   
                 R1006 = .0500 inch (1.270 mm); R1007 = .0620 inch (1.575 mm); 
               
               
                 Std. E Flute: 
                 Flute/flat = 1.24:1; The Radii (R) are as follows: 
               
               
                   
                 R1008 = .0200 inch (.508 mm); R1009 = .0300 inch (.762 mm); 
               
               
                   
                 R1010 = .0100 inch (.254 mm); R1011 = .0400 inch (1.016 mm); 
               
               
                 Std. X Flute: 
                 Flute/flat = 1.29:1; The Radii (R) are as follows: 
               
               
                   
                 R1012 = .0250 inch (.635 mm); R1013 = .0150 inch (.381 mm); 
               
               
                 Std. B Flute: 
                 Flute/flat = 1.29:1; The Radii (R) are as follows: 
               
               
                   
                 R1014 = .0410 inch (1.041 mm); R1015 = .0310 inch (.7874 mm); 
               
               
                   
                 R1016 = .0310 inch (.7874 mm); 
               
               
                 Std. C Flute: 
                 Flute/flat = 1.46:1; The Radii (R) are as follows: 
               
               
                   
                 R1017 = .0720 inch (1.829 mm); R1018 = .0620 inch (1.575 mm); 
               
               
                 Std. A Flute: 
                 Flute/flat = 1.53:1; The Radii (R) are as follows: 
               
               
                   
                 R1019 = .0720 inch (1.829 mm); R1020 = .0620 inch (1.575 mm). 
               
               
                   
               
            
           
         
       
     
     Of course other, standard, flutes definitions from the corrugated box industry are known. 
     In general, standard flute configurations from the corrugated box industry can be used to define corrugation shapes or approximate corrugation shapes for corrugated media. Comparisons above between the DCI A flute and DCI B flute, and the corrugation industry standard A and standard B flutes, indicate some convenient variations. 
     It is noted that alternative flute definitions such as those characterized in U.S. Ser. No. 12/215,718, filed Jun. 26, 2008; and published as US 2009/0127211; U.S. Ser. No. 12/012,785, filed Feb. 4, 2008 and published as US 2008/0282890 and/or U.S. Ser. No. 12/537,069 published as US 2010/0032365 can be used, with air cleaner features as characterized herein below. The complete disclosures of each of US 2009/0127211, US 2008/0282890 and US 2010/0032365 are incorporated herein by reference. 
     Another media variation comprising fluted media with facing media secured thereto, can be used in arrangements according to the present disclosure, in either a stacked or coiled form, is described in US 2014/0208705 A1, owned by Baldwin Filters, Inc., published Jul. 31, 2014, and incorporated herein by reference. 
     B. Manufacture of Media Pack Configurations Including the Media of  FIGS.  1 - 3   , See  FIGS.  4 - 7     
     In  FIG.  4   , one example of a manufacturing process for making a media strip (single facer) corresponding to strip  1 ,  FIG.  1    is shown. In general, facing sheet  64  and the fluted (corrugated) sheet  66  having flutes  68  are brought together to form a media web  69 , with an adhesive bead located therebetween at  70 . The adhesive bead  70  will form a single facer bead  10 ,  FIG.  1   . An optional darting process occurs at station  71  to form center darted section  72  located mid-web. The z-filter media or Z-media strip  74  can be cut or slit at  75  along the bead  70  to create two pieces or strips  76 ,  77  of z-filter media  74 , each of which has an edge with a strip of sealant (single facer bead) extending between the corrugating and facing sheet. Of course, if the optional darting process is used, the edge with a strip of sealant (single facer bead) would also have a set of flutes darted at this location. 
     Techniques for conducting a process as characterized with respect to  FIG.  4    are described in PCT WO 04/007054, published Jan. 22, 2004 incorporated herein by reference. 
     Still in reference to  FIG.  4   , before the z-filter media  74  is put through the darting station  71  and eventually slit at  75 , it must be formed. In the schematic shown in  FIG.  4   , this is done by passing a sheet of filter media  92  through a pair of corrugation rollers  94 ,  95 . In the schematic shown in  FIG.  4   , the sheet of filter media  92  is unrolled from a roll  96 , wound around tension rollers  98 , and then passed through a nip or bite  102  between the corrugation rollers  94 ,  95 . The corrugation rollers  94 ,  95  have teeth  104  that will give the general desired shape of the corrugations after the flat sheet  92  passes through the nip  102 . After passing through the nip  102 , the sheet  92  becomes corrugated across the machine direction and is referenced at  66  as the corrugated sheet. The corrugated sheet  66  is then secured to facing sheet  64 . (The corrugation process may involve heating the media, in some instances.) 
     Still in reference to  FIG.  4   , the process also shows the facing sheet  64  being routed to the darting process station  71 . The facing sheet  64  is depicted as being stored on a roll  106  and then directed to the corrugated sheet  66  to form the Z-media  74 . The corrugated sheet  66  and the facing sheet  64  would typically be secured together by adhesive or by other means (for example by sonic welding). 
     Referring to  FIG.  4   , an adhesive line  70  is shown used to secure corrugated sheet  66  and facing sheet  64  together, as the sealant bead. Alternatively, the sealant bead for forming the facing bead could be applied as shown as  70   a . If the sealant is applied at  70   a , it may be desirable to put a gap in the corrugation roller  95 , and possibly in both corrugation rollers  94 ,  95 , to accommodate the bead  70   a.    
     Of course the equipment of  FIG.  4    can be modified to provide for the tack beads  20 ,  FIG.  1   , if desired. 
     The type of corrugation provided to the corrugated media is a matter of choice, and will be dictated by the corrugation or corrugation teeth of the corrugation rollers  94 ,  95 . One useful corrugation pattern will be a regular curved wave pattern corrugation, of straight flutes or ridges, as defined herein above. A typical regular curved wave pattern used, would be one in which the distance D 2 , as defined above, in a corrugated pattern is at least 1.2 times the distance D 1  as defined above. In example applications, typically D 2 =1.25-1.35×D 1 , although alternatives are possible. In some instances the techniques may be applied with curved wave patterns that are not “regular,” including, for example, ones that do not use straight flutes. Also, variations from the curved wave patterns shown, are possible. 
     As described, the process shown in  FIG.  4    can be used to create the center darted section  72 .  FIG.  5    shows, in cross-section, one of the flutes  68  after darting and slitting. 
     A fold arrangement  118  can be seen to form a darted flute  120  with four creases  121   a ,  121   b ,  121   c ,  121   d . The fold arrangement  118  includes a flat first layer or portion  122  that is secured to the facing sheet  64 . A second layer or portion  124  is shown pressed against the first layer or portion  122 . The second layer or portion  124  is preferably formed from folding opposite outer ends  126 ,  127  of the first layer or portion  122 . 
     Still referring to  FIG.  5   , two of the folds or creases  121   a ,  121   b  will generally be referred to herein as “upper, inwardly directed” folds or creases. The term “upper” in this context is meant to indicate that the creases lie on an upper portion of the entire fold  120 , when the fold  120  is viewed in the orientation of  FIG.  5   . The term “inwardly directed” is meant to refer to the fact that the fold line or crease line of each crease  121   a ,  121   b , is directed toward the other. 
     In  FIG.  5   , creases  121   c ,  121   d , will generally be referred to herein as “lower, outwardly directed” creases. The term “lower” in this context refers to the fact that the creases  121   c ,  121   d  are not located on the top as are creases  121   a ,  121   b , in the orientation of  FIG.  5   . The term “outwardly directed” is meant to indicate that the fold lines of the creases  121   c ,  121   d  are directed away from one another. 
     The terms “upper” and “lower” as used in this context are meant specifically to refer to the fold  120 , when viewed from the orientation of  FIG.  5   . That is, they are not meant to be otherwise indicative of direction when the fold  120  is oriented in an actual product for use. 
     Based upon these characterizations and review of  FIG.  5   , it can be seen that a regular fold arrangement  118  according to  FIG.  5    in this disclosure is one which includes at least two “upper, inwardly directed, creases.” These inwardly directed creases are unique and help provide an overall arrangement in which the folding does not cause a significant encroachment on adjacent flutes. 
     A third layer or portion  128  can also be seen pressed against the second layer or portion  124 . The third layer or portion  128  is formed by folding from opposite inner ends  130 ,  131  of the third layer  128 . 
     Another way of viewing the fold arrangement  118  is in reference to the geometry of alternating ridges and troughs of the corrugated sheet  66 . The first layer or portion  122  is formed from an inverted ridge. The second layer or portion  124  corresponds to a double peak (after inverting the ridge) that is folded toward, and in preferred arrangements, folded against the inverted ridge. 
     Techniques for providing the optional dart described in connection with  FIG.  5   , in a preferred manner, are described in PCT WO 04/007054, incorporated herein by reference. Techniques for coiling the media, with application of the winding bead, are described in PCT application US 04/07927, filed Mar. 17, 2004 and published as WO 04/082795 and incorporated herein by reference. 
     Alternate approaches to darting the fluted ends closed are possible. Such approaches can involve, for example: darting which is not centered in each flute; and, rolling, pressing or folding over the various flutes. In general, darting involves folding or otherwise manipulating media adjacent to fluted end, to accomplish a compressed, closed, state. 
     Techniques described herein are particularly well adapted for use in media packs that result from a step of coiling a single sheet comprising a corrugated sheet/facing sheet combination, i.e., a “single facer” strip. However, they can also be made into stacked arrangements. 
     Coiled media or media pack arrangements can be provided with a variety of peripheral perimeter definitions. In this context the term “peripheral, perimeter definition” and variants thereof, is meant to refer to the outside perimeter shape defined, looking at either the inlet end or the outlet end of the media or media pack. Typical shapes are circular as described in PCT WO 04/007054. Other useable shapes are obround, some examples of obround being oval shape. In general oval shapes have opposite curved ends attached by a pair of opposite sides. In some oval shapes, the opposite sides are also curved. In other oval shapes, sometimes called racetrack shapes, the opposite sides are generally straight. Racetrack shapes are described for example in PCT WO 04/007054, and PCT application US 04/07927, published as WO 04/082795, each of which is incorporated herein by reference. 
     Another way of describing the peripheral or perimeter shape is by defining the perimeter resulting from taking a cross-section through the media pack in a direction orthogonal to the winding access of the coil. 
     Opposite flow ends or flow faces of the media or media pack can be provided with a variety of different definitions. In many arrangements, the ends or end faces are generally flat (planer) and perpendicular to one another. In other arrangements, one or both of the end faces include tapered, for example, stepped, portions which can either be defined to project axially outwardly from an axial end of the side wall of the media pack; or, to project axially inwardly from an end of the side wall of the media pack. 
     The flute seals (for example from the single facer bead, winding bead or stacking bead) can be formed from a variety of materials. In various ones of the cited and incorporated references, hot melt or polyurethane seals are described as possible for various applications. 
     In  FIG.  6   , a coiled media pack (or coiled media)  130  constructed by coiling a single strip of single faced media is depicted, generally. The particular coiled media pack depicted is an oval media pack  130   a , specifically a racetrack shaped media pack  131 . The tail end of the media, at the outside of the media pack  130  is shown at  131   x . It will be typical to terminate that tail end along straight section of the media pack  130  for convenience and sealing. Typically, a hot melt seal bead or seal bead is positioned along that tail end to ensure sealing. In the media pack  130 , the opposite flow (end) faces are designated at  132 ,  133 . One would be an inlet flow face, the other an outlet flow face. 
     In  FIG.  7   , there is (schematically) shown a step of forming stacked z-filter media (or media pack) from strips of z-filter media, each strip being a fluted sheet secured to a facing sheet. Referring to  FIG.  6   , single facer strip  200  is being shown added to a stack  201  of strips  202  analogous to strip  200 . Strip  200  can be cut from either of strips  76 ,  77 ,  FIG.  4   . At  205 ,  FIG.  6   , application of a stacking bead  206  is shown, between each layer corresponding to a strip  200 ,  202  at an opposite edge from the single facer bead or seal. (Stacking can also be done with each layer being added to the bottom of the stack, as opposed to the top.) 
     Referring to  FIG.  7   , each strip  200 ,  202  has front and rear edges  207 ,  208  and opposite side edges  209   a ,  209   b . Inlet and outlet flutes of the corrugated sheet/facing sheet combination comprising each strip  200 ,  202  generally extend between the front and rear edges  207 ,  208 , and parallel to side edges  209   a ,  209   b.    
     Still referring to  FIG.  7   , in the media or media pack  201  being formed, opposite flow faces are indicated at  210 ,  211 . The selection of which one of faces  210 ,  211  is the inlet end face and which is the outlet end face, during filtering, is a matter of choice. In some instances the stacking bead  206  is positioned adjacent the upstream or inlet face  211 ; in others the opposite is true. The flow faces  210 ,  211 , extend between opposite side faces  220 ,  221 . 
     The stacked media configuration or pack  201  shown being formed in  FIG.  7   , is sometimes referred to herein as a “blocked” stacked media pack. The term “blocked” in this context, is an indication that the arrangement is formed to a rectangular block in which all faces are 90° relative to all adjoining wall faces. For example, in some instances the stack can be created with each strip  200  being slightly offset from alignment with an adjacent strip, to create a parallelogram or slanted block shape, with the inlet face and outlet face parallel to one another, but not perpendicular to upper and bottom surfaces. 
     In some instances, the media or media pack will be referenced as having a parallelogram shape in any cross-section, meaning that any two opposite side faces extend generally parallel to one another. 
     It is noted that a blocked, stacked arrangement corresponding to  FIG.  7    is described in the prior art of U.S. Pat. No. 5,820,646, incorporated herein by reference. It is also noted that stacked arrangements are described in U.S. Pat. Nos. 5,772,883; 5,792,247; U.S. Provisional 60/457,255 filed Mar. 25, 2003; and U.S. Ser. No. 10/731,564 filed Dec. 8, 2003 and published as 2004/0187689. Each of these latter references is incorporated herein by reference. It is noted that a stacked arrangement shown in U.S. Ser. No. 10/731,504, published as 2005/0130508 is a slanted stacked arrangement. 
     It is also noted that, in some instances, more than one stack can be incorporated into a single media pack. Also, in some instances, the stack can be generated with one or more flow faces that have a recess therein, for example, as shown in U.S. Pat. No. 7,625,419 incorporated herein by reference. 
     C. Selected Media or Media Pack Arrangements Comprising Multiple Spaced Coils of Fluted Media; FIGS.  8 - 8 B 
     Alternate types of media arrangements or packs that involve flutes between opposite ends extending between can be used with selected principles according to the present disclosure. An example of such alternate media arrangement or pack is depicted in  FIGS.  8 - 8 B . The media of  FIGS.  8 - 8 B  is analogous to one depicted and described in DE 20 2008 017 059 U1; and as can sometimes found in arrangements available under the mark “IQORON” from Mann &amp; Hummel. 
     Referring to  FIG.  8   , the media or media pack is indicated generally at  250 . The media or media pack  250  comprises a first outer pleated (ridged) media loop  251  and a second, inner, pleated (ridged) media loop  252 , each with pleat tips (or ridges) extending between opposite flow ends. The view of  FIG.  8    is toward a media pack (flow) end  255 . The end  255  depicted, can be an inlet (flow) end or an outlet (flow) end, depending on selected flow direction. For many arrangements using principles characterized having the media pack  250  would be configured in a filter cartridge such that end  255  is an inlet flow end. 
     Still referring to  FIG.  8   , the outer pleated (ridged) media loop  251  is configured in an oval shape, though alternatives are possible. At  260 , a pleat end closure, for example molded in place, is depicted closing ends of the pleats or ridges  251  at media pack end  255 . 
     Pleats, or ridges  252  (and the related pleat tips) are positioned surrounded by and spaced from loop  251 , and thus pleated media loop  252  is also depicted in a somewhat oval configuration. In this instance, ends  252   e  of individual pleats or ridges  252   p  in a loop  252  are sealed closed. Also, loop  252  surrounds the center  252   c  that is closed by a center strip  253  of material, typically molded-in-place. 
     During filtering, when end  255  is an inlet flow end, air enters gap  265  between the two loops of media  251 ,  252 . The air then flows either through loop  251  or loop  252 , as it moves through the media pack  250 , with filtering. 
     In the example depicted, loop  251  is configured slanting inwardly toward loop  252 , in extension away from end  255 . Also spacers  266  are shown supporting a centering ring  267  that surrounds an end of the loop  252 , for structural integrity. 
     In  FIG.  8 A , an end  256  of the cartridge  250 , opposite end  255  is viewable. Here, an interior of loop  252  can be seen, surrounding an open gas flow region  270 . When air is directed through cartridge  250  in a general direction toward end  256  and away from end  255 , the portion of the air that passes through loop  252  will enter central region  270  and exit therefrom at end  256 . Of course air that has entered media loop  251 ,  FIG.  8   , during filtering would generally pass around (over) an outer perimeter  256   p  of end  256 . 
     In  FIG.  8 B  a schematic cross sectional view of cartridge  250  is provided. Selected identified and described features are indicated by like reference numerals. 
     It will be understood from a review of  FIGS.  8 - 8 B , the above description, that the cartridge  250  described, is generally a cartridge which has media tips extending in a longitudinal direction between opposite flow ends  255 ,  256 . 
     In the arrangement of  FIGS.  8 - 8 B , the media pack  250  is depicted with an oval, in particular racetrack, shaped perimeter. It is depicted in this manner, since the air filter cartridges in many examples below also have an oval or racetrack shaped configuration. However, the principles can be embodied in a variety of alternate peripheral shapes. 
     D. Other Media Variations,  FIGS.  9 - 12     
     Herein, in  FIGS.  9 - 12   , some schematic, fragmentary, cross-sectional views are provided of still further alternate variations of media types that can be used in selected applications of the principles characterized herein. Certain examples are described in U.S. Ser. No. 62/077,749, filed Nov. 10, 2014 and owned by the Assignee of the present disclosure, Donaldson Company, Inc. In general, each of the arrangements of  FIGS.  9 - 12    represents a media type that can be stacked or coiled into an arrangement that has opposite inlet and outlet flow ends (or faces), with straight through flow. 
     In  FIG.  9   , an example media arrangement  301  from U.S. Ser. No. 62/077,749 is depicted, in which an embossed sheet  302  is secured to a non-embossed sheet  303 , then stacked and coiled into a media pack, with seals along opposite edges of the type previously described for  FIG.  1    herein. 
     In  FIG.  10   , an alternate example media pack  310  from U.S. Ser. No. 62/077,749 is depicted, in which a first embossed sheet  311  is secured to a second embossed sheet  312  and then formed into a stacked or coiled media pack arrangement, having edge seals generally in accord with  FIG.  1    herein. 
     Edge seals can be conducted in either the upstream end or the downstream end, or in some instances both. Especially when the media is likely to encounter chemical material during filtering, it may be desirable to avoid a typical adhesive or sealant. 
     In  FIG.  11 A , a cross-section is depicted in which the fluted sheet X has various embossments on it for engagement with the facing sheet Y. Again these can be separate, or sections of the same media sheet. 
     In  FIG.  11 B , a schematic depiction of such an arrangement between the fluted sheet X and facing sheet Y is also shown. 
     In  FIG.  11    C, a still further variation of such a principle is shown between a fluted sheet X and a facing sheet Y. These are meant to help understand how a wide variety of approaches are possible. 
     In  FIG.  12   , still another possible variation in fluted sheet X and facing sheet Y is shown. 
     In  FIGS.  64  and  65   , an example media arrangement  6401  is depicted, in which a fluted sheet  6402  is secured to a facing sheet  6403 . The facing sheet  6403  may be a flat sheet. The media arrangement  6401  can then be stacked or coiled into a media pack, with seals along opposite edges of the type previously described for  FIG.  1    herein. In the embodiment shown, the flutes  6404  of fluted sheet  6402  have an undulating ridgeline including a series of peaks  6405  and saddles  6406 . The peaks  6405  of adjacent flutes  6404  can be either aligned as shown in  FIGS.  64  and  65    or offset. Further the peak height and/or density can increase, decrease, or remain constant along the length of the flutes  6404 . The ratio of the peak flute height to saddle flute height can vary from about 1.5 to 1 to 1.1 to about 1. 
     It is noted that there is no specific requirement that the same media be used for the fluted sheet section and the facing sheet section. A different media can be desirable in each, to obtain different effects. For example, one may be a cellulose media, while the other is a media containing some non-cellulose fiber. They may be provided with different porosity or different structural characteristics, to achieve desired results. 
     A variety of materials can be used. For example, the fluted sheet section or the facing sheet section can include a cellulose material, synthetic material, or a mixture thereof. In some embodiments, one of the fluted sheet section and the facing sheet section includes a cellulose material and the other of the fluted sheet section and facing sheet section includes a synthetic material. 
     Synthetic material(s) can include polymeric fibers, such as polyolefin, polyamide, polyester, polyvinyl chloride, polyvinyl alcohol (of various degrees of hydrolysis), and polyvinyl acetate fibers. Suitable synthetic fibers include, for example, polyethylene terephthalate, polyethylene, polypropylene, nylon, and rayon fibers. Other suitable synthetic fibers include those made from thermoplastic polymers, cellulosic and other fibers coated with thermoplastic polymers, and multi-component fibers in which at least one of the components includes a thermoplastic polymer. Single and multi-component fibers can be manufactured from polyester, polyethylene, polypropylene, and other conventional thermoplastic fibrous materials. The examples of  FIGS.  9 - 12 ,  64  and  65    are meant to indicate generally that a variety alternate media packs can be used in accord with the principles herein. Attention is also directed to U.S. Ser. No. 62/077,749 incorporated herein by reference, with respect to the general principles of construction and application of some alternates media types. 
     E. Still Further Media Types 
     Many of the techniques characterized herein will preferably be applied when the media is oriented for filtering between opposite flow ends of the cartridge is media having flutes or pleat tips that extend in a direction between those opposite ends. However, alternatives are possible. The techniques characterized herein with respect to seal arrangement definition can be applied in filter cartridges that have opposite flow ends, with media positioned to filter fluid flow between those ends, even when the media does not include flutes or pleat tips extending in a direction between those ends. The media, for example, can be depth media, can be pleated in an alternate direction, or it can be a non-pleated material. 
     It is indeed the case, however, that the techniques characterized herein are particularly advantageous for use with cartridges that are relatively deep in extension between flow ends, usually at least 100 mm, typically at least 150 mm, often at least 200 mm, sometimes at least 250 mm, and in some instances 300 mm or more, and are configured for large loading volume during use. These types of systems will typically be ones in which the media is configured with pleat tips or flutes extending in a direction between opposite flow ends. 
     II. Selected Identified Issues with Various Air Cleaners 
     A. General 
     Air cleaner designs, especially assemblies that use relatively deep filter media packs, for example using media in general accord with one or more of  FIGS.  6 - 12   , have proliferated. As to example actual products in the marketplace, attention is directed to the air cleaners of Donaldson Company, Inc. the Assignee of the present disclosure sold under the trade designation “Powercore;” and, also, to the products of Mann &amp; Hummel provided under the designation “IQORON.” 
     In addition, air cleaner assemblies using such media packs can be incorporated in a wide variety of original equipment (on road trucks, buses; off road construction equipment, agriculture and mining equipment, etc.) on a global basis. Service parts and servicing are provided by a wide range of suppliers and service companies. 
     B. Identification of Appropriate Filter Cartridges 
     It is very important that the filter cartridge selected for servicing be an appropriate one for the air cleaner of concern. The air cleaner is a critical component in the overall equipment. If servicing is required to occur more frequently than intended, the result can be added expense, downtime for the equipment involved and lost productivity. If the servicing is not done with a proper part, there may be risk of equipment failure or other problems. 
     The proper cartridge for the air cleaner of concern and equipment of concern, is generally a product of: product engineering/testing by the air cleaner manufacturer; and, specification/direction/testing and qualification by the equipment manufacturer and/or engine manufacturer. Servicing in the field may involve personnel selecting a part that appears to be similar to the one previously installed, but which is not a proper, rigorously qualified, component for the system involved. 
     It is desirable to provide the air cleaner assembly, regardless of media specific type, with features that will help readily identify to the service provider that an effort to service the assembly is being made with a proper (or improper) filter cartridge. Optional features and techniques described herein can be provided to obtain this benefit as described below. 
     In addition, assembly features and techniques which are advantageous with respect to manufacture and/or filter component integrity are described. These can be implemented with features and techniques of the type relating to helping ensure that the proper cartridge is installed in an assembly, or in alternate applications. 
     C. Mass Air Flow Sensor Issues 
     In many systems, a mass air flow sensor is provided downstream from the filter cartridge and upstream from the engine, to monitor air flow characteristics and contaminant characteristics. In some instances, minor modifications in media pack configuration and orientation, can lead to fluctuations in mass air flow sensor operation. It is therefore sometimes desirable to provide the air cleaner assembly with features in the filter cartridge and air cleaner, such that variation in air flow from the filter cartridge is managed to a relative minimum. This can facilitate mass air flow sensor use and operation. The features and techniques described herein can be provided to advantageously obtain this benefit. 
     D. Stable Filter Cartridge Installation 
     In many instances, the equipment on which the air cleaner is positioned is subject to substantial vibration and shock during operation. The types of media packs described above in connection with  FIGS.  6 - 12   , are often constructed relatively deep, i.e. with having depth of extension in the air flow direction of at least 50 mm and often at least 80 mm more, in many instances more than 100 mm. Such deep filter cartridges can load with substantial amounts of contaminant during use, and gain substantially in weight. Thus, they can be subject to significant vibration momenta during operation. It is desirable to provide features in the filter cartridge that help ensure stable positioning of the cartridge, avoidance of damage to the media (or media pack) in the event of movement, and avoidance of seal failure during such vibration and shock. 
     Similarly, the equipment may be subject to a wide variety of temperature ranges during storage and use. These can lead to expansion/contraction of materials relative to one another. It is desirable to ensure that the filter cartridge and air cleaner are constructed in such a manner that seal integrity is not compromised under these circumstances. The features and techniques described herein can be applied to address these concerns, as discussed below. 
     E. Protection Against Faulty Insertion 
     A variety of arrangements have been developed to address concerns of the type recited above, see, for example, WO 2006/076479; WO 2006/076456; WO 2007/133635; WO 2014/210541 and 62/097,060 each of which is incorporated herein by reference. Another issue that sometimes can rise with filter cartridge arrangements, however, is that a cartridge that does not have features for secure sealing can still be installed, in some instances, with the housing still being able to close even though an installed cartridge is not a proper one, properly sealed, for the housing of concern. It is desirable to address those issues. 
     More generally, it is desirable to provide a filter cartridge which solves the issues characterized herein above, but which also is configured such that the air cleaner housing will not properly close, if such a “faulty installation” has occurred, for example through use of a cartridge that appears to fit the housing, but does not have the proper sealing characteristics. The techniques described herein address this issue. They can be used in connection with the features of such arrangements as characterized in WO 2006/076479; WO 2006/076456; WO 2007/133635; WO 2014/210541 and/or 62/097,060, but they can be used independently as well. This will be understood from the following discussions. 
     F. Summary 
     The features characterized herein can be used to advantage to address one or more of the concerns described above. There is no specific requirement that the features be implemented in a manner that maximally addresses all concerns. However, selected embodiments are described in which all of the concerns identified above are addressed to a significant and desirable extent. 
     III. An Example Assembly, FIGS.  13 - 40   
     A. General Air Cleaner Features,  FIGS.  13 - 15   ;  19 ,  20 ,  22  and  23   
     Reference numeral  500 ,  FIG.  13   , generally indicates an air cleaner system or assembly including features in accord with the present disclosure. The air cleaner assembly  500  depicted includes a housing  501 , in which a filter cartridge  502  is removably positioned. That is, the filter cartridge  502  is a serviceable component; i.e. it is removably positioned within interior  501   i  of housing  501 . To accommodate such servicing, the housing  501  is generally configured in two housing sections,  503 ,  504 , that are configured to be selectively separated or opened, for example along joint  501   j  to allow access for removal and replacement of cartridge  502 . In the example air cleaner  500  depicted: section  503  is a housing body component or assembly; and, section  504  is an access cover component or assembly. 
     In typical use, one of the housing sections, usually housing body  503 , is mounted on equipment for use; and is not removed from this mounting during servicing. Typically, the housing cover component  504  is operated as an access cover, to allow opening access to air cleaner housing  501 , to service cartridge  502 . 
     Still referring to  FIG.  13   , the housing  501  includes an air flow inlet arrangement  505  and a filtered air flow outlet or outlet arrangement  506 . In typical operation, air to be filtered flows into the air cleaner assembly  500  through inlet arrangement  505 . It passes through the cartridge  502  with filtering, and is then removed from the housing via outlet arrangement  506  to be directed to downstream equipment, for example to an engine, combustion air, intake. In the assembly of  501  depicted, the inlet  505  is generally oriented to be upwardly directed in installation and outlet  506  to be generally directed somewhat orthogonal to the inlet direction. However, alternatives are possible. 
     In the example air cleaner assembly  500  depicted, the airflow inlet arrangement  505  is in the access cover  504 ; and, the airflow outlet arrangement  506  is in the housing body  503 . Alternatives are possible. 
     It is noted that in some air cleaner arrangements, precleaners (not shown) can be used in association with the air cleaner assembly. Precleaners can be used with principles in accord with the present disclosure. 
     Still referring to  FIG.  13   , section  504  is removably mounted on section  503  in the example depicted, by a fastener arrangement, in the example comprising bolts  507 . Of course, alternate fastening arrangements, including latches, can be used. 
     In the example air cleaner assembly  500  depicted, the access cover housing section  504  can be completely removed from the housing body  503  during servicing. Alternatives are possible. For example, hinge mounts can be used, with principles described herein. 
     Still referring to  FIG.  13   , at  510 , an optional mounting pad arrangement is depicted for securing the air cleaner assembly  500  to equipment, such as a vehicle with which it would be used. In the example, the mounting pad arrangement  510  is positioned on housing section  503 , since it is section  503  that will be anchored in place on the equipment during use. Alternatives are possible. 
     In  FIG.  14   , the air cleaner assembly  500  (of  FIG.  13   ) is depicted with the housing section  504  (i.e. the access cover) fully removed. Thus, cartridge  502  can be seen positioned on housing section  503  as it would be when properly installed or when ready to be removed. In  FIG.  14   , an optional evacuator valve member  511  is shown “exploded” from the assembly  500 . It would normally be included in the access cover  504  and is characterized below. Also, still referring to  FIG.  14   , fasteners or bolts  507  are shown where they would typically be mounted. 
     Also viewable in  FIG.  14   , is a plurality of optional, spaced, perimeter receivers  515  positioned on the housing section  503  adjacent an open end thereof. The depicted receivers  515  are open, exterior, loops on the housing that are oriented to each receive one of a plurality of projections on the access cover  504 , during attachment of the access cover  504  to the housing body  503 . 
     In more general terms, the housing  501  includes an optional projection/receiver arrangement between the two sections  503 / 504  that helps guide the section  504  to the section  503 , as connection between the two occurs. This projection/receiver arrangement comprises a plurality of first members (see projections  536 ,  FIG.  22   ) on one of the sections  503 / 504  and a plurality of second members  515  (e.g. receivers) on another of the sections  503 / 504 . In this example, the receivers  515  are on the body section  503 , but alternatives are possible. Also, a mixed arrangement can be used with both projections and receivers being appropriately positioned on each of the housing components or sections  503 ,  504 . 
     In  FIG.  15   , the cartridge  502  is shown separated from the housing  501 . The cartridge  502  generally comprises media  516  and a housing engagement arrangement  517  that extends around the media  516 . The housing engagement arrangement  517  includes a housing seal member  518 . In general, the housing engagement arrangement  517  is configured to: properly orient the cartridge  502  on the housing section  503  during installation; provide for a seal of the cartridge  502  to the housing  501  for proper air cleaner assembly operation; and, to provide for support and cushioning of the cartridge  502  in the housing  501  during use. In the example depicted, the housing engagement arrangement  517  is a molded-in-place component, which is preferred, but alternatives are possible. 
     Referring now to  FIG.  19   , the housing section  503  is depicted, with the access cover  504  and cartridge  502  removed. Mounting pad arrangement  510  can be viewed, as can receivers  515 . Also viewable in  FIG.  19    are receivers  525  for the bolts  507 ,  FIG.  14   . 
     Referring to  FIG.  19   , at  526 , an auxiliary port arrangement is provided that can be used to provide mounting of monitoring equipment, such as a restriction indicator, in the housing  501 . Also viewable in  FIG.  19   , is an auxiliary filtered air outlet  528 . The auxiliary filtered air outlet  528  can allow for transport of filtered air to another location, besides the outlet  506 , for example for operation of equipment such as a compressed air system and/or a brake system. 
     Still referring to  FIG.  19   , additional general features can be viewed. For example, the housing body  503  includes strengthening ridges, gussets and grid work  530  thereon, for structural integrity when the housing  501  is molded from a plastic. Also, at  531  some internal, bottom, ribs are shown, against which the cartridge  502  can be positioned to slide or rest, when installed. Further, at  532  a side end abutment is depicted. This can be used to engage with an end of the cartridge  502 , if desired, during cartridge installation. It can be configured with a shape for projection/receiver interaction with the cartridge, if desired. Such an abutment/interaction is shown and described in WO 2007/044677, incorporated herein by reference. 
     Referring to  FIG.  19   , it is noted that the particular air cleaner assembly  501  depicted, is configured for use without a secondary or safety cartridge. It could be configured to receive a safety cartridge downstream from the main cartridge  502 , if desired. 
     In  FIG.  19   , seal surface  568  is shown, between inner rim  567  and outer rim  569 . In use, a seal member  560  on the cartridge  502 , discussed below, is positioned pressed against seal surface  568  between the inner rim  567  and outer rim  569 , for sealing. In  FIG.  19   , rib  568   r  can be seen projecting from seal surface  568 . It will press into the seal material during sealing. 
     In  FIG.  20   , a second perspective view of housing section  503  is provided. Features previously indicated and characterized include: outlet  506 ; auxiliary port  526 ; auxiliary filtered air outlet port  528 ; receivers  515 ; fastener receivers  525  for bolts  507 ; abutment  532 ; seal surface  568 ; rib  568   r ; outer rim  569  and inner rib  567 . 
     In  FIG.  22   , the second housing section  504 , in the example an access cover, is depicted. One can see that, at an edge region  535  that engages section  503  in use, section  504  includes a plurality of tabs or perimeter projections  536  at least a portion of which are oriented to push into receivers  515 , during installation. Thus, together receivers  515  and projection arrangements  536  comprise a projection/receiver arrangement for engagement. Again, the projection/receiver arrangement can be configured with a projection arrangement on the first section  503  and a receiver arrangement on the second section  504 , or with portions of each on each. 
     Still referring to  FIG.  22   , the section  504  also includes a plurality of perimeter receivers  540  for bolts or other fasteners during installation. Further, section  504  includes various grid work, ribs, and gussets  541  for strength and material integrity. 
     In  FIG.  22   , through inlet arrangement  505 , an interior  504   i  of section  504  can be seen. At  545 , a bottom drain depression or recess in a portion of section  504  that will be upstream of the cartridge  502 , in use, can be seen. This bottom drain, depression or recess  541  can be used for collection of water, and drainage of that water through drain aperture  546 , during use. An evacuator valve member  511 ,  FIG.  14   , and referenced above, can be positioned over an exterior of drain aperture  546  in to facilitate control of evacuation of such material. Such drain arrangements are known in air cleaner assemblies; see for example WO 2007/133635 incorporated herein by reference. 
     In  FIG.  23   , a second view of the access cover or housing section  504  is depicted. Here, some features previously characterized can also be seen such as, for example: a portion of air flow inlet arrangement  505  is viewable; as are interior  504   i ; recess  545 ; drain outlet  546 ; projections  536 ; and, bolt receivers  540 . 
     B. Selected, General, Filter Cartridge Features,  FIGS.  15 - 18     
     Attention is again directed to  FIG.  15   , in which the cartridge  502  is depicted. The cartridge  502 , as indicated previously, comprises media  516  and a housing engagement arrangement  517 . 
     In general terms, the cartridge  502  has opposite flow ends  550 ,  551 . During filtering, air passes through the filter cartridge in a “straight through” flow direction between the flow ends  550 ,  551 . Typically, one of the flow ends will be an inlet flow end or flow face, and the other will be outlet flow end or flow face. Although alternatives are possible, for the example filter cartridge  502  depicted, when used with the depicted air cleaner  500 ,  FIG.  13   , flow end or face  550  is an inlet end for unfiltered air, and opposite flow end or face  551  is an outlet end for filtered air. In  FIG.  17   , cartridge  502  is shown in a view taken toward the flow outlet end  551 . 
     In general terms, cartridges of the type of cartridge  502  will be characterized herein as configured for “straight through flow”, or “axial flow” during use, referring to the fact that, generally, the cartridge  502  and the media  516  are configured so that air enters and leaves the cartridge  502 , during filtering, with flow along the same direction. This can be accommodated with any of the media types referenced herein above, and variations. 
     The example cartridge  502  depicted in  FIG.  15   , generally has a “rectangular” perimeter shape in a plane perpendicular to the flow direction; and, as a result, a rectangular inlet end or face  550  and a rectangular outlet end or face  551 . Alternate shapes are possible, including, for example, oval, and other perimeter shapes. 
     For the example cartridge  502  depicted, the media  516  is configured to have an inlet end  516   i  adjacent the cartridge inlet end  550 ; and, an opposite outlet end  516   o , not viewable in  FIG.  15   , see  FIG.  17   . The opposite surfaces or ends  516   i ,  516   o  are each depicted as generally planar, and each is in a plane generally perpendicular to a flow direction through the cartridge  502 . With the types of media characterized above that have fluted media sections secured to facing media sections, this will be typical; although alternatives are possible. For example, the surfaces  516   i ,  516   o  can be slanted relative to the flow direction; and/or can be configured with variations therein, for example recesses or projections. For example, variations of the type as found in WO 2007/133635; WO 2005/123222; and, WO 2007/044677, can be used with arrangements according to the present disclosure. 
     Still referring to  FIG.  15   , the particular cartridge  502  depicted, includes opposite side panels  554 ,  555  at opposite ends of the media  516 . The opposite panels  554 ,  555  can be used with a variety of types of media characterized herein, to close opposite media ends  516   x ,  516   y  and to provide structural integrity. Of course, if an oval unit is used, or with alternate media, there may not be a need for such panels  554 ,  555 . The use of opposite panels for closing various ones of the types of media characterized herein, above have been described, for example, in use with similar rectangular media packs in such references as WO 2005/123222; WO 2006/017790; WO 2006/076479; WO 2006/076456; and, WO 2007/133635 incorporated herein by reference. The panels  554 ,  555  can be (and typically and preferably will be) molded-in-place, but they can comprise preformed pieces that are secured over the media ends  516   x ,  516   y  with sealant. 
     The particular panels  554 ,  555  depicted are molded-in-place, for example from a material such as a polyurethane that will seal the opposite ends  516   x ,  516   y  closed. The panels  554 ,  555  may have mold artifacts therein, such as artifacts  554   x ,  FIG.  15    in panel  554 , resulting from media stand-offs used in a mold during molding in place of the panel  554 . 
     Still referring to  FIG.  15   , the particular cartridge  502  depicted is shown having optional, opposite, cover pieces or panels  558 ,  559  thereon, extending across and closing the media pack  550  in extension between the opposite ends  516   x ,  516   y , i.e. in extension between the opposite panels  554 ,  555 . Such panels or cover pieces  558 ,  559  can be useful, for example, to protect the cartridge media  516  during handling. They can be molded-in-place, or they can comprise separate pieces attached to the media. In the example depicted, they comprise plastic sheets, for example comprising a polycarbonate plastic secured in place by being embedded in molded-in-place panels  554 ,  555 . Alternatives are possible, such as a plastic net. When constructed in the manner shown, generally sealant will be provided between the panels  558 ,  559  and the media  516 , to prevent a leak path through the cartridge  502 . 
     In some applications, of the techniques described herein, the covers  558 ,  559  on each surface can each be configured in two pieces, with a joint between them located underneath a molded-in-place arrangement  517 , such that the molding-in-place of arrangement  517  can be, in part, directly to the media to help provide sealing. 
     As indicated previously, the cartridge  502  includes housing engagement arrangement  517 . The housing engagement arrangement  517  is generally a perimeter arrangement, i.e. it extends around a perimeter of a remainder of the cartridge  502 . A portion of the housing engagement arrangement  517  generally comprises the housing seal member  518 , for example a pinch seal flange  560 . The housing seal flange  560  is generally positioned and configured to form a seal with the housing  501 , when the cartridge  502  is properly installed. The particular housing seal member  518  depicted is a pinch seal flange  560  that is configured to be pinched between housing sections  503 / 504  when the housing  501  is closed. 
     A critical surface for sealing of the housing seal arrangement  518 , is a typically more downstream surface; i.e. a surface that would engage the housing  501 , during use, at a location toward a clean air side of the system  501 . In the example, this is a surface that is pressed into sealing with body  503 . That surface is the more critical sealing surface, since it is on the downstream or clean air side of the seal  560 . This referenced more critical seal surface is indicated generally in  FIG.  17   , at  560   d.    
     Referring to  FIG.  17   , it is noted that surface  560   d  is generally a flat, planar, featureless, surface in the example depicted. It can be varied (contoured) with features, for example contoured in accord with the disclosures of WO 2014/210541 and/or U.S. Ser. No. 62/097,060, incorporated herein by reference; and/or, in variations depicted and discussed below. 
     Referring back to  FIG.  15   , opposite to surface  560   d  the pinch seal member  560  includes an upstream pinch seal surface  560   u , which is generally engaged by a flange or other structure on the access cover or housing section  504 , during installation. This is where, in the example depicted, pressure is applied to the pinch seal member  560  during pinching, to ensure that the surface  560   d  seals against an appropriate surface  568  in the housing section  503 . Sealing at surface  560   u  is less critical than at surface  560   d , in the example depicted. 
     Still referring to  FIG.  15   , located in extension between opposite pinch seal surfaces  560   u ,  560   d , seal member  560  includes an outer, peripheral, surface  560   p . The outer peripheral, surface  560   p  is generally configured to fit within selected housing features, such as rim  569 ,  FIG.  19   , as needed for proper installation. 
     The thickness of region  560 , between surfaces  560   d ,  560   u  can be varied. It will typically be at least 5 mm, and usually not more than about 20 mm, often it will be between 5 mm and 15 mm, but variations are possible. 
     Referring to  FIGS.  15  and  16   , the example depicted seal surface  560   d  is configured and positioned with at least a portion that extends generally non-orthogonally to a flow direction through the cartridge media  516  (i.e. to a direction between ends  550 ,  551 ). The principles described herein can also be used with an alternate arrangement that does extend orthogonally, for example the alternate embodiment of  FIG.  42   . 
     When the seal surface  560   d  has at least a portion that extends non-orthogonally as shown, the pinch seal  560  may sometimes be referred to as a slanted seal. In the example depicted, especially when surface  560   d  is generally planar, the slant(s) can be defined as a seal slant angle, for example of at least 2° from the orthogonal. Typically, when a slant angle is used, the slant angle would be generally at least 4°, usually at least 5° and often within the range of 5°-30°, for example 7°-20°. Of course, alternatives are possible. Slanted pinch seals usable with filter cartridges of the general type characterized herein, are described for example in WO 2006/076456 and WO 2006/076479, incorporated herein by reference. 
     Referring to  FIGS.  13 ,  14  and  15   , it is noted that when the seal arrangement  517  is provided with a pinch seal member  560  that extends non-orthogonally to a flow direction through the cartridge, the cartridge  502  can be configured, in association with the housing  501 , such that the cartridge  502  can only be installed in one rotational orientation relative to the housing  501 . This can be advantageous in some instances, but is not required. 
     Also, referring to  FIG.  15   , it is noted that an extension across the opposite panel  554  or  555 , the seal  560  extends non-orthogonally; but, generally, in extension between the panels  554  or  555 , i.e., along the longer dimension of the depicted cartridge in  FIG.  15   , the pinch seal member  560  generally extends along a path of extension perpendicular to the flow direction. This is typical, but alternatives are possible. 
     Also, it is noted that when it extends across one of the sides  554 ,  555  of the rectangular configuration, the pinch seal member  560  generally extends along a straight path. While this is typical, alternatives are possible. 
     Even if surface  560   d  has some irregular or non-planar characteristic to it, for example of the type in WO 2014/210541, the remainder of the seal may still be indicated as defining a plane or slant plane in accord with the principles characterized. That is, even if surface  560   d  is not planar, but rather is contoured, the overall seal  560  may be characterized as having a general slant angle. Again, alternative shapes and possibilities are possible, however. 
     Still referring to  FIG.  15   , the housing engagement arrangement  517  includes a base, support or web portion or member  565  which supports the pinch seal member  560  on a remainder of the cartridge  502 . The particular support or web portion  565  depicted is molded integral with the peripheral pinch seal member  560 , although alternatives are possible. Being molded integral with one another is preferred, as it avoids any need for a seal between the two. 
     Again, the housing seal member could be molded onto a not molded-in-place support, which is then attached to the cartridge. This may be convenient in some applications, but, again, typically a single molded-in-place piece will be preferred. 
     Also, the particular housing engagement arrangement  517  is molded-in-place on a remainder of the cartridge, as a peripheral component. This will be typical and preferred, as it helps ensure good secure sealing between the two, with good structural integrity. The portion of the housing engagement arrangement  517  that is in engagement with the remainder of the cartridge  502  is generally the web or support portion  565 . 
     Attention is now directed to  FIG.  17   , a view of the filter cartridge  502  taken toward the exit end  551 , i.e. an end opposite that viewable in  FIG.  15   . Attention is particularly directed to recess or groove  566 . The recess or groove  566  is positioned between a portion of a pinch seal member  560  and a remainder of the cartridge  502 . The groove  566  is a recess, receiver or groove positioned to receive, projecting therein, inner rim portion  567  of a housing  501 , see  FIG.  20   , during installation. The example depicted recess, groove or trough  560  extends completely, peripherally, around the cartridge  502  at a location between seal member  560  and the media  516 . Alternatives, i.e. discontinuous recesses, can be used, especially with a discontinuous rim  567 . For example, it may be advantageous to provide gaps in the recess at the “corners” when the trough otherwise defines a generally rectangular configuration. An example of this would be to provide a “trough” that extends with straight sections along each of the four sides, but which terminates as trough sections extend toward (i.e. into or around) at least one, and typically, each one, of the four corners. That is, in some instances the trough would have no corners. Indeed, the recess  566  is optional in some applications. 
     For the particular example depicted, and referring to  FIG.  19   , the housing section  503  includes an optional rim section  567 , sized and configured project into recess  502  as installed. This rim  567  can be continuous or discontinuous, and provides a number of functions. First, it helps the cartridge  502  to snuggly rest. Secondly, it provides an isolation function between the pinch portion  560  and the cartridge body that tends to stabilize the cartridge body as it begins to load with dust and gain weight, and thus vibration momentum. Such a trough or recess is generally described, for example in such references as WO 2006/076479; WO 2006/076456; WO 2006/017790; WO 2007/133635; U.S. Ser. No. 62/097,060; and, WO 2014/210541, incorporated herein by reference. 
     Also referring to  FIG.  19   , it is noted that seal surface  568  in the housing section  503 , which is a surface against which seal surface  560   u  is compressed during sealing, includes a central rib  568   r  therein, extending peripherally around the cartridge (or housing interior). This rib  568   r  will press into surface  560   u  in pinch seal member  560 , during installation, to facilitate sealing. Also, seal surface  568  is positioned recessed between two walls, namely: rim  567  and outer rim or wall  569 . This is typical. 
     Features such as rib  568   r  are described in WO 2014/210541. The rib  568   r  will typically be continuous, and project at least 0.5 mm, for example 0.5 to 3 mm, from immediately adjacent portions of the housing  501 . 
     C. An Installation Security Arrangement between the Filter Cartridge and Housing 
     1. General 
     Herein, a security installation inhibition arrangement among a filter cartridge and housing is described and provided, that will help ensure that unless a cartridge is a proper, authenticated, one with proper seal features, it will not be able to be positioned in an air cleaner housing such that the housing can be closed during installation. This will prevent a service provider from accidently installing a cartridge that appears to fit, but is not the proper, authenticated, cartridge for the system. 
     In particular, as indicated above, servicing is often done in the field and may be done by service providers who have access to a variety of cartridges. It can be very important to ensure that the cartridge being installed is not a cartridge which appears to fit, but which is not the proper cartridge for the system. A manner in which this can be controlled, is by using an arrangement involving engagement between the cartridge and the housing that prevents the cartridge from appearing to be fully and properly nested in sealing position, unless it is the proper cartridge. 
     A variety of approaches to addressing this are characterized herein. These features, can, for example, be positioned for engagement between the cartridge  502  and housing body  503 ; and/or, they can be configured for engagement between the cartridge  502  and access cover  504 . Examples of each are characterized, and they can be used independently or together. 
     Herein, a feature or features that prevent the access cover from being able to be fully closed unless the cartridge is a proper, properly sealing, authenticated, cartridge appropriately inserted, will sometimes be referred to as a “security, housing closure, inhibition arrangement” or by similar terms. 
     A variety of features usable to accomplish this effect are described and presented herein. 
     2. A First Example Secondary Housing Closure Inhibition Arrangement Relating to Interaction Between the Cartridge  502  and the Housing Body Section  503   
     Referring first to  FIG.  19   , housing section  503 , which in the example is the downstream housing section, is provided with an open (inlet) end  513   o  having a projection arrangement  570  thereon, which comprises a first member of a security, housing closure, inhibition arrangement  570   x . In the example depicted, the projection arrangement  570  comprises a single projection  570   p , although alternatives are possible. Also, in the example depicted, the projection  570   p  is located aligned with one of the shorter sides of the housing  501  (or section  503 ), but alternate locations are possible. 
     In general, if an attempt is made to install a wrong cartridge (which would otherwise appear to fit the housing section  503 , but which is not a proper cartridge for the system  500  of concern) projection arrangement  570  will engage that wrong cartridge and prevent it from being able to be fully positioned or nested in the housing section  503  and would thus prevent the access cover  504  from being able to be mounted. However, if the cartridge  502  is a right or proper one, the cartridge  502  will have a second member of a projection receiver arrangement properly positioned to receive projection arrangement  570 , and allow the cartridge  502  to be pushed into a proper, fully nested, position for the access cover  504  to then be installed. 
     Still referring to  FIG.  19   , it is noted that the particular projection arrangement  570  is located on the radially inner rim projection  567  that extends into a cartridge recess  566  ( FIG.  17   ), during installation. Alternatives are possible. The principal issue is to have the projection arrangement  570  sized and configured so that it will engage a portion of housing engagement arrangement  517  preventing full cartridge installation into housing section  503 , unless a proper cartridge  502 , properly positioned, used. 
     In  FIG.  20   , projection arrangement  570 , i.e. projection  570   p  can be seen from the inside. Strengthening ribs  571  are viewable. In  FIG.  21   , an enlarged, fragmentary, perspective view is provided somewhat analogous to  FIG.  20   , but at a greater angle. 
     Attention is now directed to  FIG.  17   , for an understanding of a portion of the example security, housing closure, inhibition arrangement  570   x  that is positioned on the cartridge  502 . In particular, and again referring to  FIG.  17   , the cartridge  502  is depicted toward the outlet end  516   o , i.e. toward the portion of the cartridge  502  that is received on or against the housing section  503  during installation. The seal arrangement  518 , comprising pinch seal member  560  with downstream seal surface  560   d , is viewable. At  566 , the recess characterized above that receives rim  567  on the housing  501  is shown. It is noted that this recess  566  is sufficiently shallow so that it would be engaged in an inhibition manner (to installation) by projection arrangement  570 ,  FIG.  19   , unless there was adequate additional relief in it to allow full installation, as a result of the present invention. This relief is viewable in  FIG.  17   , as receiving pocket arrangement  575 . The particular depicted receiving pocket arrangement  575  comprises a single pocket  525   r , since there is only one projection  570   p , and only one possible proper installation orientation for the cartridge  502 . Receiving pocket or receiver  580   r  is configured so that if the cartridge  502  is installed in the housing  503 , projection arrangement  570  will not block the housing engagement arrangement  521  from full installation. However, if an attempt is made to install a cartridge that is relatively similar to cartridge  502 , but which does not include an appropriately positioned receiving pocket  575   r , the projection  570  will interfere with a housing engagement arrangement  517 , preventing full cartridge installation, and ultimately, preventing full access cover closure. 
     In  FIG.  18   , an enlarged fragmentary view is depicted showing the arrangement  575 , i.e. receiver  575   r.    
     As indicated above, the particular example arrangement depicted includes a single projection  570   p  in the projection arrangement  570 . In the example depicted, cartridge  502  included a single mateable receiving member  575 , i.e. pocket  575   r.    
     The receiving member  575  may comprise a plurality of pockets  575   r , if desired; and, the projection arrangement  570  could comprise a plurality of projections  570   p  if desired. 
     Again, as indicated above, when the seal the member  560  is configured as shown, and the housing  501  is analogously configured for engagement, the resulting cartridge  502  can only be installed in a single rotational orientation due to the slanted seal  560   d . However if a similar arrangement was used, but without a slant in the seal  560   d , the cartridge could theoretically be positioned in any one of two rotational orientations. When such is the case, it may be desirable to have two pockets  525   r  one each on opposite sides of the cartridge, each configured for possible full engagement with the projection  570   p , even if a single projection  570   p  is used, again to accommodate the two possible rotational installation orientations. 
     If it is desired to control the number of rotational orientations to one, then even if the seal  560  is not slanted, it may be desirable to have only one receiving pocket  575   r.    
     In  FIG.  15   , at  575   x , an exterior view is shown of an exterior portion of housing engagement component  517 , under which the interior receiver or pocket  575   r  is located. 
     Herein the pocket  575   r  is characterized as a “interior pocket”, when in the configuration shown, since it is positioned interiorly of portions  575   x  of the housing engagement arrangement  517 , i.e., it is not on an exterior surface of the cartridge but rather is an interior arrangement. It is also a “closed” interior arrangement, in that it is not open in any fashion to the exterior, when used, but rather contains the projection member  570   p , when used, in the manner shown. 
     Referring to  FIG.  23   , the access cover  504  can be seen as having an internal recess or receiver arrangement  590  therein to provide clearance for receipt of this member  575   x.    
     In the example, since there is only one member  570   p , one pocket  575   r , and the access cover  504  can only be mounted in one orientation, there is only one receiver  590   r  in arrangement  590 . Of course, alternatives are possible. 
     In  FIG.  24   , an enlarged fragmentary view of the receiver arrangement  590  and recess  590   r  are provided. 
     In  FIG.  25   , an exterior fragmentary view of a portion of the access cover  504  is provided. Here, exterior portion  590   x  for the receiver arrangement  590  is shown. This exterior section  590   x  provides that one can easily observe in the assembled air cleaner  500 , see  FIG.  13   , that it is an air cleaner arrangement that has a security, housing closure, inhibition arrangement in accord with selected features of the present disclosure. 
     In the example depicted in this section, the security, housing closure, inhibition arrangement described comprises a projection/receiver arrangement with: one member on the housing section  503  that comprises the downstream or clean air side; and, a second member on the cartridge  502 . This type of arrangement will sometimes be characterized here as a “downstream” feature or arrangement, since the portion on the housing that engages the portion on the cartridge is positioned for insertion toward a downstream side of the seal arrangement  560 . Alternatives are possible, as will be apparent from discussions below. 
     Also, it is noted that portion of the security, housing closure, inhibition arrangement on the housing  503  (i.e. the projection arrangement  570  or projection  570   p  is positioned radially inwardly from perimeter  560   p  of the housing pinch seal member  560 , in particular radially inwardly from surface  560   d . Alternately stated, projection arrangement  570  (projection  570   p ) is positioned radially inwardly from where sealing occurs between the associated housing component  503  and the seal member or arrangement  560  on the cartridge  502 . By “radially” inwardly in this context, it is meant that the positioning is interiorly of a pattern defined by the seal service  560   d , and/or perimeter  560   p , i.e. toward a central flow direction axis of the cartridge  502 . Such configurations will sometimes be characterized as a “radially interiorly engaging” arrangement, or by variants thereof. Alternatives to radially interiorly engagement arrangements are possible. 
     It is also noted that the particular projection arrangement  570  (i.e. projection  570   p ) depicted, is positioned on the ridge  567  characterized above. This is typical and straightforward to assemble and use, but alternatives are possible. 
     3. An Example Security, Housing Closure, Inhibition Arrangement Involving the Access Cover or Housing Section  504   
     Above, a security, housing closure, inhibition arrangement is characterized, which would prevent a cartridge from sufficiently nesting in a housing section  503 , for the access cover  504  to be mounted, unless the cartridge included features for proper mating, such as receiver recess  575   r . The particular, preferred, approach characterized is between the housing body and cartridge  502 , so that even before an installer begins to put the access cover in position the installer would know that the cartridge was not a proper, authenticated, one that can be properly installed for use. 
     An alternate or additional approach could be used, in which there is a sufficient interaction between the cartridge and the access cover, if an improper cartridge is used, so as to make it difficult to fully install the access cover (unless a proper cartridge was involved). This could be used with the arrangement characterized above, or alternatively in some arrangements. An example can be understood by the following. 
     Attention is directed again to  FIG.  15   . In  FIG.  15   , at  600  a first member  600  of another security housing closure interference arrangement  600   x  is depicted, in this instance configured for use to ensure that unless a cartridge  502  installed in the housing body  503  is the right one, properly installed, the access cover  504  will interfere and not close. This arrangement can be used with arrangement  570   x , or it can be used independently. The particular arrangement  600   x  depicted, would correspond to an “upstream” arrangement since it is positioned to be engaged on an upstream side of the housing seal member  518 . It is also an “open” and “exterior” arrangement, relative to arrangement  517  even though parts of it may be radially inside of surface  560   u , the at least one arrangement is “exterior” because it is not contained by the seal  560 . 
     In  FIG.  15   , the member  600  depicted is at least one receiver or recess arrangement  601  extending radially inwardly in a portion of housing engagement arrangement  517 , in the example in web  565 . In the depicted example, more than one recess  601  is depicted, but a single one can be used in some applications. In  FIG.  16   , an enlarged fragmentary view of  FIG.  15    is shown, and recesses  601  are viewable. 
     Referring to  FIG.  23   , along an interior  504   i , the access cover  504  includes a projection arrangement indicated at  605  positioned to project into the recess arrangement  600 . There are two spaced projections  605  depicted, although an alternate number is possible. The approach is to size and position the engagement arrangement  600   x  such that interference will occur as a result of projections  605 , unless an appropriate receiver arrangement  601 , for engagement, is positioned on the cartridge  502 . 
     Of course, if the cartridge  502  is configured so that it can be engaged in any of two rotational orientations, the second set of projections analogous to projections  605  could be positioned along an opposite side of the access cover  502 . 
     4. Remaining Figures of the Example Embodiment of  FIGS.  13 - 40     
     Herein above, selected ones of  FIGS.  13 - 40   , for the example air cleaner  500  were described. Additional figures are provided, for full development of understanding the features and principles. Selected additional figures not specifically discussed in detail above, are referenced here. In  FIG.  26   , a cross-sectional view of cartridge  502  is provided. The cross section is taken through the housing engagement arrangement  517  at a location through the receiver  575   r . In  FIG.  27    an enlarged fragmentary view of this portion of the cartridge  516  is shown. 
     In  FIG.  28    a cross sectional view through the air cleaner assembly is shown, indicating that seal surface  560   u  is pressed against housing surface  568  and rib  568   r , between inner rim  567  and outer rim  569 . 
     In  FIG.  29   , a fragmentary cross sectional view is depicted showing projection  570   p , on rim  587 , extending into receiver  575   r . Also, the seal member  560  can be seen positioned between the access cover  504 , housing body  503 . Overlap between the member  560  and various ones of the housing sections  503 ,  504  indicate where compression would occur, and an approximate amount of that compression that can, if desired, be used. Alternatives are possible. 
     In  FIG.  30    a second enlarged fragmentary view analogous to  FIG.  29    is shown. In addition to identified features already characterized, rib  568   r  can be seen projecting into surface  560   d  on the seal arrangement. 
     In  FIG.  31   , a second cross sectional view of the cartridge  502  is shown. Here the cross section is through a portion of the housing engagement arrangement  517  that does not have the receiver  575   r  therein, but does include recess  601 . 
     In  FIG.  32    an enlarged fragmentary view of the portion of the cartridge  502  of  FIG.  31    is shown. Again, it can be seen that the cross section is through an exterior receiver recess  601 . 
     In  FIG.  33    an enlarged cross sectional view of this portion of the air cleaner assembly is shown. Seal member  560  can again be seen compressed between sections  503 ,  504 . Also, a portion  605  of the access cover  504  projecting into receiver recess  601  can be seen. Further, rim  567 , at a location not including projection  570   p , can be seen extending into the trough  566 . 
     In  FIG.  34    an alternate perspective view of that of  FIG.  33    is shown, depicting similar features. 
     In  FIG.  35    a still further alternate perspective view is shown. Here rib  568   r  can be seen projecting into the seal member  560 . 
     In  FIG.  36    an enlarged fragmentary perspective view of a portion of the engagement arrangement  517  is shown separate from the cartridge  502 . Of course the one depicted would not typically be constructed in this manner, since it would be molded in place. However, the figure allows for inspection of selected features previously indicated. 
     In  FIG.  37    an analogous view is shown, but of an interior. Here, recess  575   r  is viewable. 
       FIG.  38    yet another cross sectional view is provided. Projection  570   p  can be seen projecting into recess  575   r.    
     In  FIG.  39    yet another cross sectional view of the air cleaner assembly in this region is shown, but in perspective. 
     In  FIG.  40    a cross sectional view and the general plane of  FIG.  39    is viewable. Projection  570   p , projecting into and being surrounded by material of the molding  517  can be seen. 
     As indicated above, variations and application of the techniques are possible. In addition, variations in the size, shape, location and amount of engagement are possible. In the next several sections, some of these possible variations are characterized. 
     IV. Some Example Assembly Variations, FIG.  41 - 44   
     A. Example Variations Depicted in the Context of an Oval Media Pack 
     As indicated above, various types of media can be used. One possibility comprises a coiled arrangement such as shown in  FIG.  6   . Also indicated above, alternatives to rectangular arrangements are possible. In the example arrangement of  FIGS.  41 - 43   , an arrangement is depicted in which the media pack has a generally oval configuration with one long cross-section axis and one short cross-section axis; and, in which the media pack can be configured from a coiled arrangement, for example as characterized in connection with  FIG.  6   . 
     Further, as indicated above, the techniques characterized herein can be used in association with a seal arrangement that does not have a flat, planar, downstream seal surface, but rather has contouring, such as by features generally in accord with WO 2014/210541. In  FIGS.  41 - 43   , an example of this is depicted in the context shown. 
     Also above, it was indicated that the techniques can applied with a seal arrangement that is not slanted, but, rather, in extension around the media pack, is generally perpendicular to the direction of airflow through the media pack. An example of this is shown in the embodiment of  FIGS.  41 - 43   . 
     Of course, the various techniques described in connection with the embodiment of  FIGS.  41 - 43    can be applied separately, or together, in alternate arrangements. 
     Referring to  FIG.  41   , a cartridge  700  is depicted, comprising media  701  extending between first and opposite ends or faces  702 ,  703 . A housing engagement arrangement  710  is shown positioned on the cartridge  700  at a location extending peripherally around the media  701 . The housing engagement arrangement comprises a seal portion  711  and a support or web portion  712 . These portions can be formed generally analogous to similar portions in the previously described embodiments. Thus, the seal portion  711  comprises a pinch seal  715  having opposite pinch surfaces  716 ,  717 . Typically surface  716  would be the downstream or critical seal surface. The seal arrangement  715  also includes an outer peripheral surface  720 . 
     At  724  a housing interactive feature is shown in the housing engagement portion  710  and in particular in the seal member  711 . This arrangement  724  is generally analogous to ones described in WO 2014/210541 and/or U.S. Ser. No. 62/097,060 incorporated herein by reference. The example depicts a region  724  of distortion or contouring from flat in surface  716 , and in particular a stepped region  725  comprising steps or projections (or projection sections)  728 ,  729  and  730 . These would be sized, located and positioned to engage mating variations in the corresponding seal surface of the housing, during use. Said engagements are described, for example in WO 2014/210541 and/or U.S. Ser. No. 62/097,060 incorporated herein by reference. Typically the projection sections  728 ,  729  and  730  would have transition sections between them or between various ones of them and other portions of the seal surface  716 , as indicated generally at  731 . A variety of such stepped arrangements is possible, including multiple projections and multiple spaced projections. Typically, a maximum total extent of projection for region  725  would be at least about 5 mm, sometimes at least 10 mm, often within the range of 5-20 mm, but alternatives are possible. 
     Also, in region  724 , the outer peripheral rim  720  is modified and in this instance with a peripherally recessed portion  740 . The peripherally recessed portion  740  can be in general accord with the descriptions of WO 2014/210541 and/or U.S. Ser. No. 62/097,060 and can be varied therefrom. It can be provided in a single location or as multiple spaced sections. In the particular example, it is oriented in alignment with the same portion  724  of the seal arrangement  711  that has the stepped region s  725  therein. Alternatives are possible. The recess region  740  can be configured to be engaged by a housing feature in an appropriate system for installation. 
     Typically, the housing seal arrangement comprising the housing engagement portion  710  and seal member  711  would be configured with a receiver recess or groove generally analogous to groove  566 ,  FIG.  17   . This could be used analogously, to receive projecting therein a ridge or rim on a housing section. 
     Referring to  FIG.  41   , an example is provided of how, for such a cartridge, a security, housing closure, interaction arrangement can be provided. With respect to this, attention is directed feature  750 , where, internally, a receiver pocket  750   r  for a projection analogous to projection  370   p  would be positioned; and, to recesses  751 , which could be used analogous to recesses  601  described above. 
     Of course, the stepped region  725  could be located in overlap with one or both of the regions  750 ,  751  if desired. 
     In  FIG.  42   , a side elevational view of cartridge  700  is depicted. In  FIG.  43   , an enlarged fragmentary view of a portion of  FIG.  42    is shown. Transition regions  731  are viewable. Such transition regions  731  would typically extend over an angle A, relative to a plane perpendicular to the flow direction through the cartridge, of angle of about 35°-85°. Also inward recess region  740  can be viewed in  FIG.  43   , which would usually correspond to an inward recess, at maximum of at least 2 mm, often at least 4 mm, and typically not more than 20 mm. 
     It is noted that in a cartridge of the type of cartridge  700  it is sometimes desirable to surround the media with a protective shield or sheath, such as described in WO 2014/210541 and/or U.S. Ser. No. 62/097,060, incorporated herein by reference. Such a sheath can be used if desired. Also, it is sometimes desirable to provide a support or preform support region embedded within molded material of the housing seal member  711 , and such members can be used here, analogously to the use in WO 2014/210541 and/or U.S. Ser. No. 62/097,060. Of course, if they were used, it may be desirable to have them include a pocket recess to accommodate features characterized herein. 
     It is also noted that in such arrangements as WO 2014/210541 and/or U.S. Ser. No. 62/097,060, the housing engagement arrangement, analogous to arrangement  710 ,  FIG.  41   , is sometimes molded-in-place with a portion in direct contact with the media. Both practices can be applied with techniques in accord with the present disclosure, if desired. 
     In the embodiment of  FIGS.  41 - 43   , region  724  is shown with a peripheral recess  740 , but the peripheral contouring could be a projection arrangement or both a projection and a recess arrangement if desired. Also, the seal surface  716  is shown with projection arrangement  725 , but it could alternately be a recess or a combination of recess and projection if desired. 
     B. Additional Possible Variations in which Features of the Security Housing Closure Inhibition Arrangement Extend, Peripherally, into the Housing Seal Member 
     Herein above, the arrangements described and depicted for the embodiment of  FIGS.  13 - 40    and for the embodiment of  FIGS.  41 - 43    features of the security, housing closure, inhibition arrangement on the cartridge are shown located in the web or support portion of the housing engagement arrangement, but not in the pinch seal member, for example not in pinch seal members  560  and  711 . Alternatives are possible. More specifically, the various features could be in the web section, the pinch seal section, or in some combination of the two. There can also be features that straddle both. An example alternate is provided in  FIGS.  44  and  45   . 
     In particular, and referring to  FIG.  44   , cartridge  800  is depicted in fragmentary view. The cartridge  800  comprises media  801  with opposite ends or flow surfaces  802 ,  803 . Cartridge  800  includes a housing engagement arrangement  805  in the example depicted, molded-in-place in extension around a remainder of the cartridge. The example cartridge includes an end panel  810  (analogous to panel  554 ,  FIG.  15   ) and protective covers or panels  811 ,  812 , analogous to covers  559 ,  558 ,  FIG.  15   . Indeed the example cartridge  800  depicted is meant to be analogous to cartridge  502 , except as described below. 
     The housing engagement arrangement  805  does comprise a pinch seal  820  and support web  821 . Further pinch seal  820  includes opposite pinch seal surfaces  820   d  and  820   u . It also has an outer periphery  820   x.    
     Here, optional recesses  830  are depicted to operate analogously to optional recesses  601 ,  FIG.  16   , with engagement with an access cover that would be appropriately configured. However, as noted by the differences, the recesses  830  can be positioned in, or partly in, the seal member  820 , or partially in both the seal member  820  and the web  805 . 
     Referring to  FIG.  45   , pocket  840 , which would operate analogously to pocket  575   r ,  FIG.  17    is depicted. It is noted, however, that for the embodiment of  FIG.  45   , the pocket  840  does have a radial extension that extends at least partly into the seal member  820 , unlike pocket  575   r ,  FIG.  17   . 
     Other features viewable in the embodiment of  FIGS.  44  and  45    are generally analogous to ones previously characterized in the embodiment of  FIGS.  13 - 40   . 
     V. An Additional Example Arrangement, FIGS.  46 - 63   
     Herein above, it was indicated that a contoured, for example “stepped” or modified, seal region somewhat analogous to region  725 ,  FIG.  41 - 43   , could be utilized in association with an assembly of the type of  FIGS.  13 - 40   . Further, it was indicated that the modified seal region  725  could be aligned with the security housing closure inhibition arrangement, if desired. An example depicting each of these possibilities is provided in  FIGS.  46 - 63   . 
     The example arrangement of  FIGS.  46 - 63    is depicted in an embodiment otherwise analogous to the embodiment of  FIGS.  13 - 40   . In this section, emphasis will be on the features demonstrating the points of differences. Generally analogous terms or depictions indicating analogous features are meant to indicate features with analogous functions. 
     Referring to  FIG.  46   , air cleaner assembly  900  is depicted comprising a housing  901 , containing a removable, serviceable, filter cartridge  902 . The housing  900  comprises separable housing sections  903 ,  904 , securable by appropriate means such as a bolt fastener or similar fastener, not shown. The housing  901  includes an airflow inlet arrangement  905  and a filtered air outlet arrangement  906 . The housing sections  903 ,  904  separate along region  907 . 
     In  FIG.  47   , the air cleaner assembly  900  is depicted with the access cover  904  removed, thus allowing the viewing of cartridge  902 , fully nested on housing section  903 . Section  903  is depicted with receivers  915  thereon, analogous to receivers  515 . 
     In  FIG.  48   , cartridge  902  is depicted in perspective view. The cartridge  902  comprises media  916 , with an inlet media end or face  916   i  and an opposite outlet media end or face  916   o  (not viewable). Thus, the cartridge  902  has an upstream flow end or face  950  and an opposite downstream end or face  951 . 
     The particular cartridge  902  includes opposite, in the example molded-in-place, panels  944 ,  945  (analogous to panels  544 ,  545 ) and also protective coverings or extensions  958 ,  959  (analogous to coverings  558 ,  559 ). These coverings ( 958 ,  959 ) are depicted extending between and embedded in the panels  944 ,  945 . 
     A housing engagement arrangement  917  is shown molded-in-place around a perimeter of the remainder of the cartridge  902 . The housing engagement arrangement comprises a seal member  960  and a support or web section  965 . 
     In  FIG.  48   , an interior recess or receiver pocket is shown at  975   r , and, at  997 , exterior recess arrangement is shown. 
     Referring to  FIG.  48   , at  1005 , a contour region generally analogous to region  724 ,  FIGS.  41 ,  42    is shown. This region includes both a contour arrangement  1006  in an outer perimeter  960   p  of seal member  960 , and also a stepped contour section  1007  in downstream seal surface  906   d  (i.e. opposite surface  960   u ). In the example arrangement, contour arrangement  1006  is a recess, but it could alternatively be a projection or have aspects of both. Also, contour section  1007  is depicted as projection section, but in alternate applications, it could be a recess section or have aspects of both. 
     In  FIG.  49   , an enlarged fragmentary view depicting region  1005  is shown. 
     In  FIG.  50   , a second fragmentary perspective view, taken generally of the same region  1005 , but toward the downstream seal surface  960   d.    
     In  FIG.  51    an analogous view is shown to  FIG.  50   , but at a different perspective, so that one can see interior receiving pocket  975   r  and trough or receiving groove  966 . 
     In  FIG.  52    another view is shown of similar portions of the cartridge  502 , but here in plan view, for further inspection of receiver  975   r , and trough  966 . 
     In  FIG.  53    a first cross sectional view of the cartridge is shown, taken generally along line  53 - 53 ,  FIG.  48   . Here a cross section is through an exterior receiver  997 . 
     In  FIG.  54    a perspective view corresponding to the same cross section, in fragmentary, is shown, but taken generally toward surface  960   d  of the seal arrangement  960 . 
     In  FIG.  55    a second cross sectional view is taken generally along line  55 - 55 ,  FIG.  48   , but shown in fragmentary. Here, the cross section is through the receiver pocket  975   r , providing for inspection of this feature. The view is still generally toward downstream surface  960   d  and seal member  960 . It is also through the largest step  1010  of the stepped region  1007 . 
     In  FIG.  56    an enlarged fragmentary view of the molded-in-place portion of the housing engagement arrangement  917  is shown. 
     In  FIG.  57    an interior view of the same portion of arrangement  917  is shown. 
     In  FIG.  58    a cross sectional view is taken at plane  58 - 58 ,  FIG.  57    is shown. 
     In  FIG.  59    a perspective view of the housing section  903  is depicted. Viewable are gridwork  930 , outlet  906 , auxiliary outlet  928 , mounting pads  910 , guide/slide ribs  931 , receivers  915 , projection arrangement  970  comprising projection  970   p . Features generally analogous in appearance and location to those previously referenced above in variations discussed can be used. 
     In  FIG.  60    a second perspective view shown fragmentary of the housing section  903  is viewable. 
     In  FIG.  61    a plan view of housing section  903  is shown. Here a mating stepped recess section  968   s  for engagement with the stepped region  1007  is shown. Also seal rib  968   r  that presses into the seal member in use, is shown, in seal surface  968  between inner and outer rims  967  and  969 . 
     In  FIG.  62   , an exterior view of the housing section  903  taken toward the stepped region  968   s  is shown. 
     In  FIG.  63    a perspective view of the section of  FIG.  62    is shown. 
     It is noted that the interior of the access cover  904  is not shown. For the particular embodiment depicted, the access cover  904  may be generally the same as access cover  504 . 
     From the above description and inspection of  FIGS.  46 - 63   , it can be understood that the principles of the present application can be applied in which a contoured seal region, in accord, for example, with WO 2014/210541 and/or U.S. Ser. No. 62/097,060, incorporated herein by reference, can be applied in an arrangement which is otherwise analogous to  FIGS.  13 - 40   . Further it is depicted in alignment or overlap with a portion of the cartridge that also includes a receiving pocket  575   r , i.e., a portion of the security, housing closure, inhibition arrangement. Of course it can be located not in such alignment if desired. 
     Further, while the principles are shown in a connection with a slanted seal in  FIGS.  46 - 63   , they can be implemented with alternate seals, including ones that are not slanted but rather extend generally in a plane perpendicular to a flow direction through the cartridge, but for the contoured region  1007 . 
     VI. Some Selected Specific Features and Additional Variations 
     A. Variations in the Shape, Size, and Location of a Projection Arrangement Analogous to Projection  570 ,  570   p ;  970 ,  970   p  as Part of an Internal, Closed, Security Housing Closure Inhibition Arrangement 
     Herein above, in example projection arrangements  570 ,  970 , are described and depicted in various embodiments, as a portion or projection arrangement positioned on the housing body ( 503 ,  903 , respectively) and projecting toward the access cover ( 504 ,  904 , respectively). As explained, variations in these arrangements are possible. The particular example arrangements depicted, each included one projection ( 570   p ,  970   p , respectively). The number and location of such projections can be varied. 
     Typically, each projection (e.g.  570 ,  570   p ,  970 ,  970   p ) will have a length of projection toward the other housing section  504 ,  904  of at least 20 mm, usually at least 30 mm and often at least 40 mm. This will help ensure adequate interference with an improper cartridge, for the intended operation. The maximum length of the projection ( 570   p ,  970   p ) is a matter of choice for the system of concern, once it is adequately long to ensure the desired interaction with an improper cartridge. Typically, the maximum lengths will not greater than 100 mm and often not greater than 80 mm in a variety of systems. 
     Typically and preferably, the extent of projection of the projection arrangement  570 ,  970  (i.e., of projections  570   p ,  970   p ) is at least 15 mm further than the depth of any receiving groove  566 ,  966  in an associated cartridge (but for the receiving pocket  575   r ,  975   r ). Usually it is at least 25 mm deeper and often at least 35 mm deeper. 
     Typically, the amount of extension of the projection arrangement  570 ,  970  ( 570   p ,  970   p ) is adequately far to extend axially beyond the upstream or opposite seal surface ( 560   u ,  960   u ), so that when a proper cartridge is installed, the projection arrangement extends well past the seal arrangement  560 ,  960  in extension toward the other housing piece or access cover  504 ,  904 . Preferably, this amount of extension is at least 15 mm, usually at least 25 mm; and, often at least 35 mm. (Analogously, the at least one receiving pocket  575   r ,  975   r  preferably extends at least 15 mm, usually at least 25 mm, often at least 35 mm further, toward cartridge end or flow face of the media pack than either seal surface. The end or flow face toward which the receiving pocket extends from the pinch seal, will sometimes be referenced as an “associated” end or flow face. 
     A variety of shapes for the individual projections  570   p ,  590   p , can be used. A shape having a relatively wide base region in peripheral extension where it attaches to the remainder of the housing, with a narrow tapering in the same dimension toward a free end or tip, is preferred, as it helps insertion occur while the service provider is supporting and locating a cartridge. Typically a base having a width of at least 15 mm, usually at least 25 mm, often at least 35 mm; and, a fee end or tip no greater in width that about 90% of the base; typically no greater than about 80% of the base is preferred. In the example depicted, the projections  570   p ,  590   p , have blunt out tips or free ends, but alternatives are possible. 
     Typically and preferably the individual projections  570   p ,  590   p  are relatively thin in thickness (dimension from radial exterior to radial interior) even in the region of the ribs  571 ,  FIG.  20   . A thickness no greater than 10 mm and typically no greater than 5 mm will be usable. Alternatives are possible. 
     In the example arrangement depicted, the side edges,  FIG.  20   , each extend at an obtuse angle (the same or different) from the base toward the free end. This is typical, but alternatives are possible. 
     Typically and preferably, the individual projections  570   p ,  590   p , are oriented to project straight (in the flow direction) toward the access cover. This facilitates cartridge installation, but alternatives are possible. 
     It is noted that in the example depicted, the projections  570   p ,  590   p , are located on and are integral with, rims  566  and  966 , respectively. This is typical, but alternatives are possible. 
     In the examples depicted, the projections  570   p ,  590   p , are located in overlap with a shorter dimension of a rectangular cartridge, or the curved end and shorter dimension of the oval cartridge. This is typical, but alternatives are possible. For example, the projection arrangements can be orient aligned with a longer dimension instead of the sides. However, it is desirable to position them along a side that is located near the service provider in use, to help the service provider detect the interference interaction inhibiting closing, if an improper cartridge is being used. 
     B. Selective Features and Variations in the Portion of the Security Housing Closure, Inhibition Arrangement on the Filter Cartridge 
     Herein above, in the examples of  FIGS.  13 - 40  and  46 - 63   , the member of the security housing closure inhibition arrangement on the filter cartridge, is a receiving pocket or recess arrangement  575   r ,  975   r , respectively. In the example, this pocket  575   r ,  975   r  is a deepened portion in engagement with a receiving groove  566 ,  966  that is somewhat shallow and otherwise extends all the way around the cartridge. This is typical, but alternatives are possible. 
     Typically, the receiving pockets  575   r ,  975   r  are at least 10 mm deeper than an associated trough or recess  566 ,  966 , usually, at least 20 mm deeper. Often, they are at least 200% deeper (3 times as deep), usually at least 400% deeper (5 times as deep) or more. 
     Typically, each ( 575   r ,  975   r ) extends at least 10 mm toward an associated cartridge end face from the seal member  560 ,  960 , (i.e. from either pinch seal surface) typically at least 20 mm and usually at least 30 mm or more, for example at least 35 mm or even at least 40 mm. 
     Typically each is at least 20 mm deep, usually at least 25 mm deep. 
     Typically, the longest dimension of the receiving pockets  575   r ,  975   r  at the entrance thereto, is at least 15 mm, usually at least 20 mm, and often greater 25 mm. Typically, it extends at least 10 mm further than each of the opposite surfaces (e.g. surfaces  560   d ,  560   u ) of the pinch seal portion, usually at least 20 mm further, often at least 25 mm further. 
     In the examples depicted, the housing engagement portions  519 ,  917  comprise molded-in-place material. This is typical, but in some instances portions of these can be formed and preformed sections. 
     When the housing engagement portions are made as molded in placement arrangements, typically they are molded from the same material as is used for the housing seal arrangement, and are integral therewith. Such material, for example, comprise a polyurethane or other foamed material, molded to an as-molded density of no greater than 0.48 g/cc, typically no greater than 0.35 g/cc; and a hardness, Shore A, of no greater than 30, typically no greater than 20, often within the range of 10-20, inclusive. Alternatives, of course, are possible. 
     Referring to the figures, exterior recesses  601 ,  901  are typically at least 3 mm deep in maximum relief from adjacent portion of the housing engagement arrangement, typically at least 7 mm deep, in maximum relief from at least some adjacent portions, sometimes 10 mm deep or more. 
     When the housing seal arrangement includes a step feature in accord with the depictions of  724  in  FIG.  42    and at  1007  in  FIG.  50   , usually each step individual has a maximum amount of projection relative to an immediately adjacent portion of the seal surface, of at least 2 mm, often at least 5 mm, usually within the range of 5-20 mm; and, the overall stepped region has a maximum amount of projection, relative to unstepped regions of the same seal surface, of at least 5 mm, usually at least 8 mm, and often within the range of 10-30 mm. Multiple projection regions and space projection regions around the perimeter can be used. These can be located along long sides, curved sides, opposite sides etc., as may be desired. 
     A contour in a perimeter portion was described for example, in  FIG.  42    at  740 , and in  FIGS.  50  and  1006   . These are depicted in overlap with a stepped region, but alternatives are possible. One or more contour regions can be used. When they are used, they are generally a maximum relief of at least 2 mm, usually at least 5 mm, relative to non-contoured portions of the outer perimeter of the seal member in which they are positioned. 
     C. Shape and Size of the Media Pack; Symmetry/Asymmetry in the Cartridge; Other Cartridge Sections 
     The arrangements depicted are generally are non-circular shapes for the media pack. Both rectangular perimeters and oval perimeters are shown. The features characterized herein are particularly desirable, when used with cartridges that have one relatively long width (cross) dimension by comparison to a shorter dimension taken perpendicular thereto. Typically, the media packs will have a longest width cross-dimension to maximum cross-dimension perpendicular thereto, of at least 1.5, usually at least 2 and often within the range of 2-5. 
     Often the media pack will be relatively large, with a total width of at least 150 mm, for example at least 300 mm, and sometimes on the order of 400-800 mm. Often the dimension perpendicular will be not greater than 200 mm. Such large, wide, and shallow (perpendicular to width) media packs can be used to fit a variety of equipment. While the features characterized herein can be used with other sized and shaped media packs, they were developed to accommodate many field issues that are associated with such large media packs. 
     The features characterized were particular developed for use with relatively deep media packs in extension between the upstream and downstream ends. While the techniques can be used with other types of media packs, it will typically be used with media packs having a length between the opposite flow ends of at least 50 mm, typically at least 80 mm, and often on the order of 90-450 mm. 
     The cartridge features can be provided in an asymmetric arrangement or a symmetric arrangement as desired. The symmetry or asymmetry can both be rotational with respect to an axis through the media pack in extension between flow ends; or, with respect to a plane through the media pack either: half-way along a longer cross-dimension and perpendicular thereto; or, half-way along a shorter cross-dimension and perpendicular thereto. Various features of the housing engagement arrangement can be made symmetrical or asymmetrical with respect to either of these concepts, as may be desired. Asymmetrical ones can be used to ensure that the cartridge can only be installed in a single orientation, if desired. Symmetrical arrangements can be used to allow the cartridge to be installed in more than orientation. Of course, the housing could be modified in general accord with these principles as well. 
     The cartridge can be provided with a handle arrangement thereon adjacent the inlet side. Also, the cartridge and access cover can be configured for a different engagement to provide sealing pressure. 
     It is noted that although the housing cannot be used with a cartridge that does not have appropriate features (member) for engagement with the member of the security, housing closure, inhibition, arrangement; the cartridge typically can be properly installed in a housing that does not have a member of the security, housing closure, inhibition arrangement, but is otherwise an analogous housing. 
     D. Variations in Housing Configuration 
     The housing can be configured with a wide variety of variations from those depicted. For example, the inlets and outlets can be alternately located and configured. 
     Further, the housing can be configured such that the cartridge is in a recessed portion of a housing section, rather than adjacent and in overlap with an outer edge thereof. When this is done, the mating housing section would typically have a projection that extends into the housing sufficiently far, to push the seal arrangement into the desired seal engagement. Such features are shown and described for example, in WO 2014/210541 and/or U.S. Ser. No. 62/097,060, incorporated herein by reference, and can be used in association with the security housing closure arrangement in accord with the present disclosure. 
     The housing can be configured with a pre-cleaner as part of the housing, for example, as described in U.S. Ser. No. 62/097,060, incorporated herein by reference. 
     The size of the housing can be varied greatly, in a variety of applications. However, the features are particularly well configured for use with a housing that a relatively large cartridge therein. 
     VII. Some Final Comments and Observations 
     In the following section, text is provided in the form of claims. The claims comprise characterizations indicating a variety of options, features, and feature combinations that can be used in accord with the teachings of the present disclosure. Alternate characterizations of the ones given, but consistent with the descriptions herein above, are possible.