Patent Publication Number: US-2022228427-A1

Title: Door assemblies with insulated glazing unit venting

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS AND CLAIM TO PRIORITY 
     This application is a continuation of U.S. application Ser. No. 16/867,329, filed May 5, 2020, now U.S. Pat. No. 11,293,212, which is a continuation of application Ser. No. 15/662,814, filed Jul. 28, 2017, which is related to U.S. Provisional Patent Application No. 62/368,556, filed Jul. 29, 2016, which is incorporated herein by reference in its entirety and to which priority is claimed. 
    
    
     FIELD OF THE INVENTION 
     This invention relates to door assemblies with vented insulated glazing units (IGU), and to methods of making and using the same. 
     BACKGROUND 
     Traditional solid wood doors have become relatively expensive due to raw material costs. A commonplace alternative to traditional solid wood doors in residential and commercial buildings is a door assembly that includes a rectangular doorframe of stiles and rails, and door skins secured to the opposite sides of the doorframe. The door skins can be made of, for example, steel, fiberglass composites, cellulosic (e.g., wood) composites, high density fiberboard (HDF), medium density fiberboard (MDF), and other materials. The door cavity between the door skins typically includes a core. The core can be a pre-formed structure or formed in situ, such as by injecting a foam precursor composition into the door cavity and allowing the precursor composition to expand and fill the door cavity with foam. Wood grain can be molded or embossed onto the exterior surfaces of the door skins. Further, paneling can be formed in the exterior surfaces of the door skins to give an appearance that simulates solid wood products. 
     The door assemblies may also include glazing inserts, especially IGUs, which are typically double-glazing (double-pane) or triple-glazing (triple-pane) structures with a sealed cavity between the panes. U.S. Pat. Nos. 9,290,989, 9,125,510, and 9,080,380 and U.S. Application Publication Nos. 2016/0010386 and 2008/0245003, each assigned to Masonite Corporation, disclose door assemblies including IGUs. 
     The inventors have determined that issues may arise when the door assembly construction does not permit gas flow exchange between the sealed cavity of the IGU and the outside atmosphere/environment. A lack of pressure balance between the IGU sealed cavity and the outside atmosphere can result in deflection of glazing panes—either inwardly towards the sealed cavity or outwardly away from the sealed cavity. A pressure differential can arise due to changes in temperature and/or altitude (for example, during shipping of the IGU-containing door assembly). Deflection of glazing panes caused by a pressure differential is particularly noticeable with Simulated Divided Lite (SDL) glazing units, such as when grilles of the SDL structure are applied on external or internal surfaces of the glazing panes. When the panes deflect inward or outward, for example due to temperature or altitude changes, the grilles deflect with the glazing panes or separate from the glazing panes, so that the IGU does not accurately simulate the appearance of a true divided light IGU. Lack of pressure balance in the IGU may also create stress along the sealed perimeter of the IGU. This can result in failure of the IGU&#39;s seal, thereby reducing the life of the IGU. In the case of IGUs with components such as blinds inside the sealed cavity, inward deflection (bowing) of the glazing panes can interfere with the blind raise/lower and/or tilting mechanism(s), resulting in performance issues. 
     SUMMARY OF THE INVENTION 
     A first aspect of the invention provides a door assembly including a doorframe having opposite first and second sides, an insulated glazing unit (IGU), first and second door skins, a door core component, and a gas passageway. The insulated glazing unit includes a substantially sealed IGU cavity and a first hole communicating with the substantially sealed IGU cavity. The first and second door skins are respectively secured to the first and second sides of the doorframe and have respective openings within which the insulated glazing unit is provided. The door core component is positioned within a door cavity between the first and second door skins and in direct contact with the insulated glazing unit. The gas passageway provides gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. The gas passageway may include a gas passage conduit, e.g. a capillary, passing through at least a portion of the door core component, and including a first end communicating with the substantially sealed IGU cavity through the first hole and a second end communicating with the atmosphere outside of the door assembly. 
     A second aspect of the invention provides a door assembly including a doorframe having opposite first and second sides, an insulated glazing unit, first and second door skins, a gas passage conduit, and a channel. The insulated glazing unit includes an IGU spacer, a first glazing pane having a first exterior surface, a second glazing pane having a second exterior surface that is opposite to the first exterior surface, a substantially sealed IGU cavity, and a first hole communicating with the substantially sealed IGU cavity. The first and second door skins are respectively secured to the first and second sides of the doorframe and have respective openings within which the insulated glazing unit is provided. The first door skin has a first lip secured directly to the first exterior surface of the first glazing pane of the insulated glazing unit and the second door skin has a second lip secured directly to the second exterior surface of the second glazing pane. The gas passage conduit includes a first end communicating with the substantially sealed IGU cavity through the first hole and a second end communicating with an air pocket within the door assembly. The channel connects the air pocket with atmosphere outside of the door assembly. The gas passage conduit, the air pocket, and the channel provide a gas passageway for gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. 
     A third aspect of the invention provides a door assembly including a doorframe having opposite first and second sides, an insulating glazing unit, first and second door skins, and a gas passage conduit. The insulated glazing unit includes a substantially sealed IGU cavity and a first hole communicating with the substantially sealed IGU cavity. The first and second door skins are respectively secured to the first and second sides of the doorframe and have respective first and second openings within which the insulated glazing unit is provided. The gas passage conduit includes a first end communicating with the substantially sealed IGU cavity through the first hole and a second end extending to and communicating with a second hole or an air pocket in the doorframe that communicates with atmosphere outside of the door assembly. The gas passage conduit and the air pocket provide a gas passageway to effect gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. 
     A fourth aspect of the invention provides a method of making a door assembly. An insulated glazing unit (IGU) is provided between openings of first and second door skins, and the first and second door skins are respectively secured to opposite first and second sides of a doorframe. The insulated glazing unit has a first hole communicating with a substantially sealed IGU cavity of the insulated glazing unit. A first end of a gas passage conduit is positioned in communication with the first hole of the insulated glazing unit, and a second end of the gas passage conduit is positioned in communication with atmosphere outside of the door assembly to permit gas exchange between the IGU cavity and the atmosphere outside of the door assembly. A door core component is positioned within a door cavity between the first and second door skins and in direct contact with the insulated glazing unit, and the gas passage conduit passes through at least a portion of the door core component. 
     A fifth aspect of the invention provides a method of making a door assembly. An insulated glazing unit (IGU) is provided between openings of first and second door skins, and the first and second door skins are respectively secured to opposite first and second sides of a doorframe. The insulated glazing unit has a first hole communicating with a substantially sealed IGU cavity of the insulated glazing unit. The first door skin has a first lip secured directly to a first exterior surface of a first glazing pane of the insulated glazing unit and the second door skin has a second lip secured directly to a second exterior surface of a second glazing pane of the insulated glazing unit. A first end of a gas passage conduit is positioned in communication with the first hole of the insulated glazing unit, and a second end of the gas passage conduit is positioned in communication with an air pocket within the door assembly. The door assembly further includes a channel connecting the air pocket with atmosphere outside of the door assembly to permit gas exchange between the IGU cavity and the atmosphere outside of the door assembly. The gas passage conduit, the air pocket, and the channel provide a gas passageway for gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. 
     A sixth aspect of the invention provides a method of making a door assembly. An insulated glazing unit (IGU) is provided between openings of first and second door skins, and the first and second door skins are respectively secured to opposite first and second sides of a doorframe. The insulated glazing unit has a first hole communicating with a substantially sealed IGU cavity of the insulated glazing unit. A first end of a gas passage conduit is positioned in communication with the first hole of the insulated glazing unit, and a second end of the gas passage conduit is positioned in communication with a second hole or an air pocket in the doorframe that communicates with atmosphere outside of the door assembly. The gas passage conduit, and the air pocket provide a gas passageway for gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. 
     According to a seventh aspect of the invention, a method of venting a door assembly is provided. The door assembly includes a doorframe having opposite first and second sides, an insulated glazing unit (IGU), first and second door skins, a door core component, and a gas passage conduit. The insulated glazing unit includes a substantially sealed IGU cavity and a first hole communicating with the substantially sealed IGU cavity. The first and second door skins are respectively secured to the first and second sides of the doorframe and have respective openings between which the insulated glazing unit is provided. The door core component is positioned within a door cavity between the first and second door skins and in direct contact with the insulated glazing unit. Venting is performed through the gas passage conduit that passes through at least a portion of the door component and includes a first end communicating with the substantially sealed IGU cavity through the first hole and a second end communicating with atmosphere outside of the door assembly. 
     An eighth aspect of the invention provides a method of venting a door assembly. The door assembly includes a doorframe having opposite first and second sides, an insulated glazing unit (IGU), first and second door skins, and a channel. The insulated glazing unit includes an IGU spacer, a first glazing pane having a first exterior surface, a second glazing pane having a second exterior surface that is opposite to the first exterior surface, a substantially sealed IGU cavity, and a first hole communicating with the substantially sealed IGU cavity. The first and second door skins are respectively secured to the first and second sides of the doorframe and have respective openings between which the insulated glazing unit is provided. The first door skin has a first lip secured directly to the first exterior surface of the first glazing pane of the insulated glazing unit and the second door skin has a second lip secured directly to the second exterior surface of the second glazing pane of the insulated glazing unit. Venting is performed through a gas passage conduit and the channel. The gas passage conduit includes a first end communicating with the substantially sealed IGU cavity through the first hole and a second end communicating with an air pocket within the door assembly. The channel connects the air pocket with atmosphere outside of the door assembly. The gas passage conduit, the air pocket, and the channel provides a gas passageway for gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. 
     A ninth aspect of the invention provides a method of venting a door assembly. The door assembly includes a doorframe having opposite first and second sides, an insulating glazing unit, first and second door skins, and a gas passage conduit. The insulated glazing unit includes a substantially sealed IGU cavity and a first hole communicating with the substantially sealed IGU cavity. The first and second door skins are respectively secured to the first and second sides of the doorframe and have respective first and second openings between which the insulated glazing unit is provided. The gas passage conduit includes a first end communicating with the substantially sealed IGU cavity through the first hole and a second end extending to and communicating with a second hole or an air pocket in the doorframe that communicates with atmosphere outside of the door assembly. Venting is performed through a gas passage conduit and the second hole or the air pocket. The gas passage conduit and the air pocket (or the second hole) provides a gas passageway for gas communication between the sealed IGU cavity and the atmosphere outside the door assembly. 
     Aspects and exemplary aspects, embodiments and methods described herein are particularly advantageous for and applicable to door packaging, transportation, and installation, especially pre-hung doors. 
     It should be understood that the various aspects of the invention described above may be combined with one another and that substitutions of components and/or steps of one aspect may be substituted into other aspects. 
     Other aspects of the invention, including pre-assembled kits, other assemblies, subassemblies, packaged and unpackaged door units, methods and processes, and the like which constitute part of the invention, will become more apparent upon reading the following detailed description of the exemplary embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are incorporated in and constitute a part of the specification. The drawings, together with the summary given above and the detailed description of the exemplary embodiments and methods given below, serve to explain the principles of the invention. In such drawings: 
         FIG. 1  is a perspective view of a door assembly with insulated glazing unit venting according to a first exemplary embodiment of the invention; 
         FIG. 2  is a front elevation of the door assembly of  FIG. 1 ; 
         FIG. 3  is a cross-sectional view taken along sectional line  3 - 3  of  FIG. 2 ; 
         FIG. 4  is a cross-sectional view taken along sectional line  4 - 4  of  FIG. 2 ; 
         FIG. 5  is an enlarged sectional view of circle  5  of  FIG. 4 ; 
         FIG. 6  is a front elevation of a door assembly with insulated glazing unit venting according to a modification of the first exemplary embodiment of the invention; 
         FIG. 7  is a cross-section taken along sectional line  7 - 7  of  FIG. 2  illustrating a door assembly with insulated glazing unit venting according to a second exemplary embodiment of the invention; 
         FIG. 8  is a cross-sectional view taken along sectional line  8 - 8  of  FIG. 2  illustrating a door assembly with insulated glazing unit venting according to a first variation of a third exemplary embodiment of the invention; 
         FIG. 9  is an enlarged sectional view of circle  9  of  FIG. 8 ; 
         FIG. 10  is a front elevation of a door assembly with insulated glazing unit venting according to a fourth exemplary embodiment of the invention; 
         FIG. 11  is a cross-sectional view taken along sectional line  11 - 11  of  FIG. 10  illustrating a door assembly with insulated glazing unit venting according to a fourth exemplary embodiment of the invention; 
         FIG. 12  is a cross-sectional view taken along sectional line  12 - 12  of  FIG. 2  illustrating a door assembly with insulated glazing unit venting according to a second variation of the third exemplary embodiment of the invention; and 
         FIG. 13  is a fragmentary cross-sectional view of a door assembly where the insulated glazing unit is fixed in place with insulated glazing unit frames. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the exemplary embodiments and methods as illustrated in the accompanying drawings, in which like reference characters designate like or corresponding parts throughout the drawings. It should be noted, however, that the invention in its broader aspects is not necessarily limited to the specific details, representative materials and methods, and illustrative examples shown and described in connection with the exemplary embodiments and methods. 
     An exemplary door assembly is generally designated by reference numeral  10  in  FIGS. 1 and 2 , and is also referred to herein as door  10 . Although the door assembly  10  is illustrated as an entryway door, it should be understood that the principles of the present invention may be applied to interior doors, residential doors, doors for commercial and industrial buildings, and the like. 
     As best shown in  FIGS. 1 and 3 , door assembly  10  includes a doorframe generally designated by reference numeral  12 . The doorframe  12  includes a plurality of doorframe members connected to one another to establish a rectangular frame. In particular, the doorframe  12  includes first and second vertically extending stiles  14 , of which the right stile, designated by reference numeral  14 , is shown in  FIG. 1 . The stiles  14  are parallel to one another and spaced apart from one another to establish opposite sides (left and right sides) of the door assembly  10 . The doorframe  12  further includes top and bottom horizontally extending rails at the top and bottom edges of the door assembly  10 . In  FIG. 1 , the top rail, designate by reference numeral  16 , is shown. The rails  16  are parallel to one another and spaced apart from one another at opposite ends (top and bottom ends) of the door assembly  10 . The opposite ends of the rails  16  are secured by fasteners (e.g., screws, nails, or bolts) and/or adhesive to the stiles  14  to collectively form the rectangular doorframe  12 . Although not shown, the doorframe  12  may further include intermediate stiles, intermediate rails, a lock block, hinge blocks and/or other supports and frame members. The door assembly  10  may be an entry door dimensioned to allow passage of an average size human. For example, standard door sizes range from about 10 inches to about 36 inches in width and about 6.5 feet to about 8 feet in height. The door assembly  10  may also be used with custom doors, including doors outside of the aforementioned ranges. 
     The door assembly  10  further includes first and second door skins (also referred to in the art as door facings)  18  and  20 , respectively. As best shown in  FIGS. 3 and 4 , the first door skin  18  includes an exterior surface  18   a  facing away from a first side of the doorframe  12  and an opposite interior surface  18   b  facing towards and secured to the first side of the doorframe  12 . Likewise, the second door skin  20  includes an exterior surface  20   a  facing away from a second side of the doorframe  12  and an opposite interior surface  20   b  facing towards and secured to the second side of the doorframe  12 . Adhesive and/or fasteners secure the door skins  18  and  20  to the opposite first and second sides of the doorframe  12 . For example, a polyurethane or polyvinyl acetate adhesive may be used. In certain embodiments, the stiles and rails may be secured to the door skins  18 ,  20  only and need not be secured to each other. That way, the door skins  19 ,  20  holds the stiles and rails in place to form the doorframe  12 . 
     The door skins  18  and  20  may be molded from an appropriate composite material and typically have a thickness of, for example, about 0.13 mm (0.05 inches) to about 52 mm (0.20 inches), depending on the door application in which they are used and the skin material selected. The selected material of the door skins  18  and  20  can be a sheet molding compound or “SMC” for short. Generally, SMCs include, for example, about 15 to about 30 weight percent of the thermosetting resin composition, about 3 to about 20 weight percent low profile additive, about 10 to about 30 weight percent reinforcement, typically fiberglass, and typically other ingredients, such as filler, fire retardants, mold release agents, shelf inhibitors, wetting agents, homogenizers, UV retardants, pigments, thickening agents, antioxidants, antistatic metals, colorants, and/or other additives. Concentrations may be adjusted as warranted for obtaining desired properties. The above composition is provided by way of example, and is not limiting. Other natural or synthetic materials that may be selected for the door skins  18  and  20  include bulk molding compounds (BMCs), medium density fiberboard, high density fiberboard, reinforced thermoplastics (e.g., polypropylene, polystyrene), and metals such as steel. The door skins  18  and  20  may be made of the same or different materials. 
     Any suitable molding technique may be employed for making the door skins  18  and  20 , including, for example, compression molding, resin transfer molding, injection compression molding, thermoforming, etc. Generally, compression molding involves introducing the SMC onto a lower die, then moving one or both dies towards the other to press the SMC under application of heat and pressure in order to conform the SMC to the contour of the die surfaces defining the closed mold cavity. Sheet molding compounds are often pressed within a temperature range of, for example, about 135° C. (275° F.) to about 177° C. (350° F.). The dies exert a pressure on the composition of, for example, about 1000 to about 2000 psi. The pressing operation often lasts, for example, about 30 seconds to 2 minutes. A method for making a SMC door skin is disclosed in U.S. Pat. Pub. No. 2013/0199694. The procedures and parameters herein provided are by way of example, and are not limiting. 
     The exterior surfaces  18   a  and  20   a  of the door skins  18  and  20  are illustrated as flush with planar surfaces. Alternatively, one or both of the exterior surfaces  18   a  and  20   a  may include contours, such as a contoured portion surrounding and defining an inner molded panel  19 , as shown in  FIGS. 1 and 2 . The inner molded panel(s)  19  may be coplanar with, recessed from, or elevated relative to the planes in which the exterior surfaces  18   a  and  20   a  principally extend. The exterior surfaces  18   a  and  20   a  may be smooth or molded/embossed to simulate a design or pattern, such as a wood grain design. The interior surfaces  18   b  and  20   b  of the door skins  18  and  20  may have relatively rough or textured surfaces to increase the surface area for adhesion to the doorframe  12  and a door core, if one is used. The contour and smoothness/roughness of the exterior surfaces  18   a  and  20   a  and interior surfaces  18   b  and  20   b  can be controlled by selecting mold dies having corresponding cavity-defining surfaces. The door skins  18  and  20  may be mirror images of one another or may possess different contours, patterns, and other features. 
     The door assembly  10  also includes hardware, such as a door knob  24  and latch  26  on one side of the door assembly  10  and hinges (not shown) on the opposite side of the door assembly  10  for pivotally mounting the door assembly  10  to a wall structure or doorjamb and allowing swinging of the door assembly  10  between open and closed positions. It should be understood that the door assembly  10  may include other hardware, and may be slidable (for example, along tracks) rather than pivotal between open and closed positions. 
     As best shown in  FIGS. 3 and 4 , the first and second door skins  18  and  20  include first and second lips  43  and  45 , respectively. The first and second lips  43  and  45  are angled relative to the substantially planar major areas of the door skin outer surfaces  18   a  and  20   a . The first lip  43  terminates at a first elongate rib (or fin)  44  and the second lip  45  terminates at a second elongate rib (or fin)  46 . The first and second lips  43  and  45  and their respective ribs  44  and  46  surround and define openings  18   c  and  20   c  ( FIG. 3 ), respectively. The openings  18   c  and  20   c  of the first and second door skins  18  and  20  are aligned with each other. 
     As best shown in  FIGS. 3 and 4 , the interior surface  18   b  includes an elongate internal ridge or wall  40  in relatively close proximity to the opening  18   c . Likewise, the interior surface  20   b  includes an elongated ridge or wall  42  in relatively close proximity to the opening  20   c . The ridges  40  and  42  preferably are formed integrally with the remainder of the door skins  18  and  20 , respectively, for example, during molding. The ridges  40  and  42  extend inwardly towards one another to surround the openings  18   c  and  20   c , yet are spaced apart from one another by a gap (unnumbered). The ridges  40  and  42  may be used as screw bosses to connect the door skins  18  and  20  to one another. In certain embodiments, as described below and shown in  FIG. 12 , the ridges  40  and  42  may extend toward one another until they are in contact. In that case, no gap exists between the ridges  40  and  42 . 
     An insulated glazing unit (IGU)  30  is received between the respective openings  18   c  and  20   c  of the first and second door skins  18  and  20 . The IGU  30  is illustrated as including first and second panes  34  and  36  secured together by an IGU spacer  32  that separates the panes  34  and  36  from another. It should be understood that the IGU  30  may include one or more additional panes. For example, an additional pane may be secured in face-to-face abutting arrangement with the pane  34  or the pane  36 , or the additional pane may be interposed between and spaced apart from both the panes  34  and  36 . The panes  34  and  36  may be glass whereas the additional pane may be a polymer material bonded to one of the panes  34  or  36 . The IGU may be one that is hurricane rated, such that a polymer film is applied to one or both of the interior surfaces of the panes  34 ,  36  to minimize breakage due to impact. 
     An IGU cavity  38  substantially sealed within the IGU frame  32  between the panes  34  and  36  is shown in, for example,  FIG. 3 . The IGU cavity  38  between the panes  34  and  36  may be filled with a gas, such as, for example, air. In the illustrated first exemplary embodiment of  FIGS. 1-5 , the IGU  30  is a double-pane insulated IGU. The panes  34  and  36  can be made of, for example, clear sheet glass, tinted glass, and/or textured/patterned glass. The panes  34  and  36  can be made of other transparent materials or combinations of transparent materials, including plastics such as acrylics and polycarbonate. A combination of plastic and glass panes may be used. A decorative grille or insert (not shown) may be included within the IGU cavity  38 . Mechanism such as blinds likewise may be included with the IGU cavity  38 . 
     Although not shown, the IGU  30  may include an internal grille or internal grilles within the IGU cavity  38 , an external grille on the exterior surface of one of the panes  34  or  36 , and/or external grilles on the exterior surfaces of the panes  34  and  36 . Similarly, the IGU  30  may include an internal SDL bar or internal SDL bars within the IGU cavity  38 , an external SDL bar on the exterior surface of one of the panes  34  or  36 , and/or external SDL bars on the exterior surfaces of the panes  34  and  36 . 
     The IGU  30  may have an alternative geometry, such as that of a square, a circle, an oval, a triangle, other polygons, etc. The IGU  30  may possess a combination of linear and curved edges, etc. IGUs are commercially available and often sold as pre-assembled products that can be incorporated into the doors embodied and described herein. The IGU  30  selected may be configured to withstand impact, e.g., to be hurricane rated. Although only a single IGU  30  is shown in each of the illustrated exemplary embodiments, it should be understood that the present invention encompasses a door assembly having two, three, four, or more IGUs. For door assemblies having multiple IGUs, the IGUs may be made of the same or different material from one another, and may have the same or different shapes from one another. 
     The ribs  44  and  46  of the door skins  18  and  20  contact the exterior surfaces of the panes  34  and  36 , respectively, of the glazed unit  30 . As best shown in  FIG. 3 , a sealant and/or adhesive  50  is provided at an interface of an interior surface of the lip  43  and the exterior surface of the pane  34 . Similarly, a sealant and/or adhesive  52  is provided at an interface of an interior surface of the lip  45  and the exterior surface of the pane  36 . The sealant may be a structural adhesive. The direct securing of the lips  43  and  45  to opposite exterior surfaces of the panes  34  and  36  using sealant/adhesive provides a “frameless” structure, i.e., a frame is not used to interconnect the door skins  18  and  20  to the IGU  30 . The ribs  44  and  46  provide a seal to prevent the flow of the sealants and/or adhesives  50  and  52  beyond the interior surfaces  18   b  and  20   b  into the visible area of the panes  34  and  36 . Unless otherwise indicated, the sealants and/or adhesives  50  and  52  may be a sealant only, an adhesive only, or a combination of a sealant and an adhesive. In the case of a combination of sealant and adhesive, separate sealants and adhesives can be combined, e.g., intermixed. Alternatively, certain compounds, such as structural sealants, can perform both sealant and adhesive functions. A structural sealant with a commercial impact rating is suitable. The sealant may be a moldable compound, such as a paste or foam, or a component such as a gasket or weather strip. The sealant and/or adhesive  50  may be the same or different from the sealant and/or adhesive  52 . 
     A door core  28  is situated in a door cavity (unnumbered) defined at opposite sides by the interior surfaces  18   b  and  20   b  of the first and second door skins  18  and  20  and at inner and outer peripheries by the IGU spacer  32  and the doorframe  12 . Although not shown, there may be a sealant and/or adhesive on the outer surface of the IGU spacer  32 . For the purposes of this description, the sealant and/or adhesive is considered part of the IGU spacer  32 . The door core  28  can be a foam material, such as a polyurethane foam, and more preferably is formed in situ in the door cavity by introducing a one-component or multiple-component foam precursor into the door cavity of an already assembled door, and allowing foaming to occur in the door cavity so that the core  28  fills the door cavity. Alternatively, one or more pre-formed door core components may be placed into against the interior surface  18   b  or  20   b  of the door skins  18  or  20  prior to securing the other door skin  18  or  20  thereto. Adhesive may secure the door component(s) to the interior surfaces  18   b  and  20   b.    
     As best shown in  FIGS. 4 and 5 , the door assembly  10  of the first exemplary embodiment of the invention further includes a gas passage conduit  60  embodied as a capillary tube  60 . A first end  60   a  of the capillary tube  60  communicates with the IGU cavity  38 . The first end  60   a  of the capillary tube  60  extends to and optionally through a first hole (unnumbered) formed (e.g., by drilling) in the IGU spacer  32 . The IGU spacer  32  can be a hollow or solid spacer. Thus, the first end  60   a  of the capillary tube  60  is illustrated entering through the outer wall of the hollow IGU spacer  32  and into the IGU cavity  38 . However, the first end  60   a  does not necessarily go into the sealed cavity  38  or through the IGU spacer inner wall, which may have slits, holes, or the like for communicating the first end  60   a  with the sealed cavity  38 . Those skilled in the art will recognize that a capillary tube, such as the capillary tube  60 , has a relatively small diameter opening extending through the tube  60 . Although not show, a sealant may be applied at the interface of the IGU spacer  32  and the capillary tube  60  to prevent leaks from the IGU cavity  38 . 
     The opposite second end  60   b  of the capillary tube  60  communicates with atmosphere outside of the door assembly  10 . As best shown in  FIG. 5 , the capillary tube  60  extends through a portion of the door core  28  between the outer surface of the pane  34  and the lip  43  of the first door skin  18 . The second end  60   b  of the capillary tube  60  is shown extending slightly beyond the rib  44 . Extending the second end  60   b  beyond the rib  44  prevents the sealant  50  from squeezing out past the rib  44  and blocking the second end  60   b  of the capillary tube  60 . Alternatively, the rib  44  may extend beyond the second end  60   b , so that the capillary tube  60  and its second end  60   b  are concealed from sight behind the rib  44  yet in communication with the outside atmosphere. 
     The second end  60   b  of the capillary tube  60  is in a Day Light Opening (DLO) position to permit the exchange of gas (e.g., air) between the IGU cavity  38  and the outside atmosphere. The gas exchange permits pressure balance and alleviates pressure differentials between the outside atmosphere and the IGU cavity  38  due to, for example, changes in temperature and/or altitude (the latter occurring, for example, during transportation of the door assembly  10 ). In this regard, because of the relatively small diameter of the opening of the capillary tube  60 , the capillary tube  60  allows for a limited exchange of gas with the outside atmosphere Thus, the IGU cavity  38  is referred to herein as substantially sealed. Other than gas exchanged through the capillary tube  60 , the IGU cavity  38  preferably is otherwise sealed to prevent gas (e.g., air) from escaping from or entering into the IGU cavity  38 . 
     The capillary tube  60  (of the first and other exemplary embodiments described herein) may be made of stainless steel. Other materials, particularly other non-corrosive metals or plastics may be selected as the capillary tube  60 . An exemplary capillary tube has an inner (hole) diameter of about 0.019 inch (about 0.048 cm) and an outer (tube) diameter of about 0.032 inch (about 0.081 cm). These exemplary measurements may differ, for example ±0.005 inch (±0.013 cm), and often slightly differ from manufacturer to manufacturer. Relatively small internal diameters of capillary tubes limit the rate of gas flow between the IGU cavity  38  and the outside atmosphere. If the gas flow is too high, excessive moisture can enter into the IGU cavity  38 , leading to loss of thermal performance as well as condensation on the interior surfaces of the panes  34  and  36 . On the other hand, if gas flow is too low, pressure balance can take significant time, and can lead to deflection of the panes  34  and  36  and/or seal breakage before pressure is balanced. 
     As best shown in  FIG. 5 , the capillary tube  60  extends along an edge of a shim  62 , preferably abutting the edge of the shim  62 . The cross-sectional view of  FIG. 5  depicts the shim  62  behind the capillary tube  60 . In the normal vertical orientation of the door assembly  10  illustrated in  FIGS. 1 and 2 , the shim  62  is positioned below the capillary tube  60 . Thus, the capillary tube  60  extends along and preferably abuts the top edge of the shim  62  in the illustrated embodiment. The capillary tube  60  has a thickness (that is, diameter in the illustrated embodiment, measured in a direction perpendicular to the exterior surface of the pane  34 ) that is equal to or preferably less than the thickness (measured in the same direction) of the shim  62 . The shim  62  prevents pinching and/or crushing of the capillary tube  60  between the lip  43 /rib  44  and the pane  34 . 
     It should be understood that various modifications can be made to the first exemplary embodiment. For example, the door assembly  10  can include two or more of the capillary tubes  60 , for example, spaced about different sides of the insulated IGU  30 . The shim  62  can be positioned above or below the capillary tube  60 . Another modification is shown in  FIG. 6 , in which components functionally or structurally similar to the components of the first exemplary embodiment of  FIGS. 1-5  are labeled with the same reference numerals with the addition of the suffix capital letter “A”. In  FIG. 6 , IGU  30 A includes blinds  31 A in the IGU cavity (unnumbered). A sliding adjuster  64 A accessible on the exterior surface of the first door skin  18 A that controls up/down movement or tilting of blinds  31 A of the IGU  30 A. The shim  62  of the first exemplary embodiment of  FIGS. 1-5  is replaced with a planar flange portion  62 A or another structure of a base of the sliding adjuster  64 A. The flange portion  62 A extends between the pane  34  and the lip  43  of the first door skin  18 A. The capillary tube  60  (not shown in  FIG. 6 , but identical in location to that shown in  FIG. 5 ) extends along an edge the flange portion  62 A, which preferably is at least as thick and more preferably thicker than the diameter of the capillary tube  60 . 
     Various methods can be practiced to make the door assembly  10  of the first exemplary embodiment. According to one exemplary method, the first end  60   a  of the gas passage conduit  60  is positioned in communication with the first hole of the IGU  30 , and the second end  60   b  of the gas passage conduit  60  and the shim  62  are placed on the first lip  43 . The interior surface  18   b  of the first door skin  18  and both surfaces of the shim  62  are coated with an adhesive at least at frame-receiving and IGU-receiving locations. The doorframe  12  and the IGU  30  are then laid on the adhesive-coated first door skin  18 . The interior surface  20   b  of the second door skin  20  is coated with an adhesive at least at frame-receiving and IGU-receiving locations. Additionally or alternatively, areas of the IGU  30  and the doorframe  12  that are to receive the second door skin  20  are coated with adhesive. The second door skin  20  is laid on the IGU  30  and the doorframe  12 . The assembly may be pressed to permit curing and hardening of the adhesive. The core  28  is formed in situ by spraying or injecting a precursor into the door cavity, preferably after assembly of the door skins  18  and  20 , the doorframe  12 , the IGU  30 , and the gas passage conduit  60 . The method may be accomplished using additional or fewer steps. Also, the steps may be performed in different sequences than described herein. For example, the doorframe  12  and the IGU  30  may be laid on the second door skin  20  instead of the first door skin  18 . 
       FIG. 7  illustrates a cross-sectional view of a door assembly  110  of a second exemplary embodiment of the invention. The door assembly  110  may have the same perspective view and elevational view as depicted in  FIGS. 1 and 2 , respectively. In  FIG. 7 , components that are unchanged from the first exemplary embodiment of the present invention are designated with the same reference characters as used above. Corresponding components that are structurally and/or functionally changed from the first exemplary embodiment are designated by the same reference numerals but in the  100  series. For example, gas passage conduit  160  of  FIG. 7  generally corresponds to the gas passage conduit  60  of  FIGS. 4 and 5 . 
     In the door assembly  110  of the second exemplary embodiment of  FIG. 7 , the gas passage conduit  160  includes a capillary tube  163  and a thicker vent tube  165 . A first end  163   a  of the capillary tube  163  communicates with the IGU cavity  38 . The first end  163   a  of the capillary tube  163  extends to and optionally through a first hole (unnumbered) formed (e.g., by drilling) in the IGU spacer  32 . The IGU spacer  32  can be a hollow spacer. Thus, the first end  163   a  of the capillary tube  163  is shown entering through the outer wall of the hollow IGU spacer  32  and into the sealed cavity  38 . However, the first end  163   a  does not necessarily go into the sealed cavity  38  or through the IGU spacer inner wall, which may have slits, holes, or the like. Although not show, a sealant may be applied at the interface of the IGU spacer  32  and the capillary tube  163  to prevent leaks from the IGU cavity  38 . 
     The opposite second end  163   b  of the capillary tube  163  is received in a first end  165   a  of the thicker vent tube  165  to connect the capillary tube  163  to the vent tube  165 . The second end  163   b  may be frictionally fit into the first end  165   a . Depending on the material for the vent tube, the internal diameter of the vent tube  165  may be larger than the external diameter of the capillary tube  163 . This connection is secured by the door core  28 , which preferably is formed in situ after assembling the door skins  18  and  20 , the IGU  30 , and the frame  12  to one another. 
     The opposite second end  165   b  of the vent tube  165  extends to and preferably through a second hole (unnumbered) in the stile  14  to communicate with atmosphere outside of the door assembly  110 . The second hole may be formed in the stile  14  by drilling, for example. A sealant may be provided at the interface of the vent tube  165  and the second hole of the stile  14  to prevent the foam precursor composition from escaping through the second hole during in situ formation of the core  28 . 
     The gas passage conduit  160  allows for the exchange of gas (e.g., air) between the IGU cavity  38  and the outside atmosphere to balance pressure and alleviate pressure differentials between the outside atmosphere and the IGU cavity  38  due to, for example, changes in temperature and/or altitude (the latter occurring, for example, during transportation of the door assembly  110 ). Notably, the gas passage conduit  160  of this second exemplary embodiment is arranged so as to not become pinched between interfacing structures of the door assembly  110 . 
     It should be understood that various modifications can be made to the second exemplary embodiment. For example, the door assembly  110  can include two or more of the gas passage conduits  160 , for example, spaced about the perimeter of the IGU  30 . As another modification, the capillary tube  163  and the vent tube  165  may be joined end-to-end, rather than overlapping as shown. As still another modification, the vent tube  165  can be omitted so that the capillary tube  163  extends continuously from the substantially sealed IGU cavity  38  to and optionally through the second hole in the stile  14 . According to a further modification, the gas passage conduit  160  may extend through one of the rails  16 , preferably the lower rail, rather than one of the stiles  14 , to better conceal the second opening in the doorframe  12  from view. 
     Various methods can be practiced to make the door assembly  110  of the second exemplary embodiment. According to one exemplary method, the interior surface  18   b  of the first door skin  18  is coated with an adhesive at frame-receiving and IGU-receiving locations. The doorframe  12  and the IGU are laid on the adhesive-coated first door skin  18 . The first end  163   a  of the gas passage conduit  160  is positioned in communication with the first hole of the IGU  30 , and the second end  165   b  of the gas passage conduit  160  is positioned in communication with the second hole in the doorframe  12 . The interior surface  20   b  of the second door skin  20  is coated with an adhesive at frame-receiving and IGU-receiving locations. Additionally or alternatively, areas of the IGU  30  and the doorframe  12  that are to receive the second door skin  20  are coated with adhesive. The second door skin  20  is then laid on the IGU  30  and the doorframe  12 . The assembly may be pressed to permit curing and hardening of the adhesive. The core  28  is formed in situ by spraying or injecting a precursor composition into the door cavity. The method may be accomplished using additional or fewer steps. Also, the steps may be performed in different sequences than described herein. 
       FIGS. 8 and 9  illustrate a cross-sectional view of a door assembly  210  of a third exemplary embodiment of the invention. The door assembly  210  may have the same perspective view and elevational view as depicted in  FIGS. 1 and 2 , respectively. In  FIGS. 8 and 9 , components that are unchanged from the first exemplary embodiment of the present invention are labeled with the same reference characters as used above. Corresponding components that are structurally and/or functionally changed from the first exemplary embodiment are designated by the same reference numerals but in the  200  series. For example, gas passage conduit  260  of  FIGS. 8 and 9  generally corresponds to the gas passage conduit  60  of  FIGS. 4 and 5 . 
     In  FIGS. 8 and 9 , the door assembly  210  further includes a dam  268  that extends across the interior thickness of the door cavity from the interior surface  18   b  of the first door skin  18  to the interior surface  20   b  of the second door skin  20 . The dam  268  may also abut against the internal ridges  40  and  42  of the first and second door skins  18  and  20 . The dam  268  thereby partitions the door cavity that receives the door core  28  from an air pocket  270 . The air pocket  270  is defined at its opposite sides by the interior surfaces  18   b  and  20   b  of the first and second skins  18  and  20 , respectively, and at its inner and outer peripheries by the IGU spacer  32  and the dam  268 . The air pocket  270  and the dam  268  space the door core  28  from the IGU  30 . The dam  268  is made of a material that prevents leakage of the core precursor therethrough, so that the door core foam precursor introduced into the door cavity does not leak into the air pocket  270 . The dam  268  may be made of a variety of materials, but preferably is made of a relatively low weight material, such as corrugated cardboard. Alternatively, as illustrated in  FIG. 12 , the ridges  40  and  42  extend toward one another until they are in contact, essentially forming a dam partitioning the door cavity that receives the door core  28  from the air pocket  270 . 
     A gas passage conduit  260  embodied as a capillary tube in  FIGS. 8, 9, and 12  has a first end  260   a  that communicates with the IGU cavity  38 . The first end  260   a  of the capillary tube  260  extends to and optionally through a first hole (unnumbered) formed (e.g., by drilling) in the IGU spacer  32 . The IGU spacer  32  can be a hollow spacer. Thus, the first end  260   a  of the capillary tube  260  may enter through the outer wall of the hollow IGU spacer  32 , but does not necessarily go into the sealed cavity  38  or through the IGU spacer inner wall, which may have slits, holes, or the like for communicating the first end  260   a  with the sealed cavity  38 . Although not show, a sealant may be applied at the interface of the IGU spacer  32  and the capillary tube  260  to prevent leaks from the IGU cavity  38 . 
     The opposite second end  260   b  of the capillary tube  260  communicates with the air pocket  270 . A channel (unnumbered) in the form of a gap extends between the outer surface of the pane  34  and the interior surface of the lip  43  of the first door skin  18  in the cross-section of  FIG. 8 . In the illustrated embodiment, a vent tube  272  is positioned within the channel, and provides fluid communication between the air pocket  270  and the outside atmosphere. A first end  272   a  of the vent tube  272  is located in the air pocket  270 , and a second end  272   b  of the vent tube  272  is shown extending slightly beyond the rib  44 . Extending the second end  272   b  of the vent tube  272  beyond the rib  44  prevents the sealant  50  from squeezing out past the rib  44  and blocking the second end  272   b  of the vent tube  272 . Alternatively, the rib  44  may extend beyond the second end  272   b  of the vent tube  272 , so that the vent tube  272  is concealed from sight behind the rib  44  yet in communication with the outside atmosphere. 
     The second end  272   b  of the vent tube  272  is in a Day Light Opening (DLO) position. The capillary tube  260 , the air pocket  270 , and the vent tube  272  collectively allow for the flow and exchange of gas (e.g., air) between the IGU cavity  38  and the outside atmosphere to balance pressure and alleviate pressure differentials between the outside atmosphere and the IGU cavity  38  due to, for example changes in temperature and/or altitude (the latter occurring, for example, during transportation of the door assembly  210 ). 
     It should be understood that various modifications can be made to the third exemplary embodiment. For example, the door assembly  210  may include two or more of the capillary tubes  260  and/or two or more of the vent tubes  272 , for example, spaced about the IGU  30 . Although not shown, the vent tube  272  can be placed adjacent to a shim similar to the shim  62  to prevent accidental pinching of the vent tube  272 . The vent tube  272  is optional, and may be omitted to provide an empty gap (between the lip  43  and the pane  34 ) as the channel that places the air pocket  270  in fluid communication with the outside atmosphere. The empty gap can be made by including a temporary component between the lip  43  and the exterior surface of the pane  34  when assembling the door assembly  210 , and removing the temporary component subsequent to assembling the door assembly  210 . 
     For example, the capillary tube  260  and vent tube  272  configuration shown in  FIG. 12  may also be practiced with the door assembly  210  shown in  FIG. 13 . In  FIG. 13 , the door assembly  210  includes a first IGU frame  400  and a second IGU frame  402 , which hold the IGU  30  in the openings  18   c  and  20   c . The first and second IGU frames  400  and  402  are connected together with a fastener  408 , e.g. a screw as illustrated in  FIG. 13 , to fix the IGU  30  in place. The first IGU frame  400  contains a first portion  404  that presses, and preferably seals against the first pane  34  with a sealant  409 , and a second portion  405  that presses, and preferably seals against the first door facing  18  with the sealant  409 . Likewise, the second IGU frame  402  contains a first portion  406  that presses, and preferably seals to the second pane  36  with the sealant  409 , and a second portion  407  that presses, and preferably seals to the second door facing  20  with the sealant  409 . The first and second IGU frames  400  and  402  hold the IGU  30  in spaced relation to the door core  28 . The space between the door core  28  and the IGU  30  forms an air pocket  270  that is enclosed by the IGU  30 , the first and second IGU frames  400  and  402 , and the door core  28  (along with the door skins  18  and  20 ). As previously described for  FIGS. 8, 9, and 12 , a gas passage conduit  260 , embodied as a capillary tube, allows for gas communication between the IGU cavity  38  and the air pocket  270 ; and a vent tube  272  provides fluid communication between the air pocket  270  and the outside atmosphere. As illustrated in  FIG. 13 , the locations of the gas passage conduit  260  is identical to that described above for  FIG. 9 . The vent tube  272  is positioned within a channel (unnumbered) in the form of a gap extending between the outer surface of the pane  34  and the interior surface of the first portion  404  of the first IGU frame  400 . In the illustrated embodiment, a vent tube  272  is positioned within the channel. 
     Various methods can be practiced to make the door assembly  210  of the third exemplary embodiment. According to one exemplary method, the interior surface  20   b  of the second door skin  20  is coated with an adhesive at frame-receiving and IGU-receiving locations. The doorframe  12  and the IGU  30  are then laid on the adhesive-coated second door skin  20 . The first end  260   a  of the gas passage conduit  260  is positioned in communication with the first hole of the IGU  30 , and the second end  260   b  of the gas passage conduit  260  is placed on the air pocket  270 . The dam  268  is set on the interior surface  20   b  of the second door skin  20  adjacent to and abutting the ridge  42 . The interior surface  18   b  of the first door skin  18  is coated with an adhesive at frame-receiving and IGU-receiving locations. Additionally or alternatively, areas of the IGU  30  and the doorframe  12  that are to receive the first door skin  18  are coated with adhesive. The first door skin  18  is then laid on the IGU  30  and the doorframe  12 . The vent tube  272  is inserted into the channel between the pane  34  and the lip  43 . The assembly may be pressed to permit curing and hardening of the adhesive. The core  28  is formed in situ by spraying or injecting a precursor composition into the door cavity. The method of this third exemplary embodiment may be accomplished using additional or fewer steps. Also, the steps may be performed in different sequences than described herein. 
       FIGS. 10 and 11  illustrate a fourth exemplary embodiment of a door assembly. In  FIGS. 10 and 11 , components that are unchanged from the first exemplary embodiment of the present invention are labeled with the same reference characters as used above. Corresponding components that are structurally and/or functionally changed from the first exemplary embodiment are designated by the same reference numerals but in the  300  series. For example, gas passage conduit  360  of  FIGS. 10 and 11  generally corresponds to the gas passage conduit  60  of  FIGS. 4 and 5 . 
     In the fourth exemplary embodiment of  FIGS. 10 and 11 , the gas passage conduit  360  is embodied as a capillary tube having a first end  360   a  in communication with the IGU cavity  38 . The first end  360   a  of the capillary tube  360  extends to and optionally through a first hole (unnumbered) formed (e.g., by drilling) in the IGU spacer  32 . The IGU spacer  32  can be a hollow spacer. Thus, the first end  360   a  of the capillary tube  360  may enter through the outer wall of the hollow IGU spacer  32  and into the IGU cavity  38 . However, the first end  360   a  does not necessarily go into the sealed cavity  38  or through the IGU spacer inner wall, which may have slits, holes, or the like for communicating the first end  360   a  with the sealed cavity  38 . Although not show, a sealant may be applied at the interface of the IGU spacer  32  and the capillary tube  360  to prevent leaks from the IGU cavity  38 . 
     The opposite second end  360   b  of the capillary tube  360  extends through the door core  28  and to an air pocket  370  formed in the stile  14 . The air pocket  370  is in turn in communication with a channel  372  that communicates with atmosphere outside of the door assembly. The air pocket  370  and the channel  372  may be embodied as a kerf in the stile  14 . To simplify construction, the gas passage conduit  360  may be inserted through the door cavity prior to formation or insertion of the door core  28 . 
     The gas passage conduit  360 , the air pocket  370 , and the channel  372  collectively allow for the exchange of gas (e.g., air) between the IGU cavity  38  and the outside atmosphere to balance pressure and alleviate pressure differentials between the outside atmosphere and the IGU cavity  38  due to, for example changes in temperature and/or altitude (the latter occurring, for example, during transportation of the door assembly  310 ). Notably, the gas passage conduit  360  of this fourth exemplary embodiment is arranged so as to not become pinched between interfacing structures of the door assembly  310 . 
     It should be understood that various modifications can be made to the fourth exemplary embodiment. For example, the door assembly  310  can include two or more of the gas passage conduits  360 , for example, spaced about the perimeter of the IGU  30 . As another modification, the gas passage conduit  360  can comprise a combination of a capillary tube and a vent tube, similar as discussed above and illustrated in  FIG. 7  in connection with the second exemplary embodiment. According to a further modification, the gas passage conduit  360  may extend to and the channel  372  may be located in one of the rails  16 , preferably the lower rail, rather than one of the stiles  14 , to better conceal the second end of the channel  372  from view. 
     Various methods can be practiced to make the door assembly  310  of the fourth exemplary embodiment. According to one exemplary method, the channel or kerf  372  is formed in the doorframe  12 . The interior surface  18   b  of the first door skin  18  is coated with an adhesive at least at frame-receiving and IGU-receiving locations. The doorframe  12  and the IGU  30  are then laid on the adhesive-coated first door skin  18 . The first end  360   a  of the gas passage conduit  360  is positioned in communication with the first hole of the IGU  30 , and the second end  360   b  of the gas passage conduit  360  is inserted into communication with the air pocket  370  of the doorframe  12 . The interior surface  20   b  of the second door skin  20  is coated with an adhesive at least at frame-receiving and IGU-receiving locations. Additionally or alternatively, areas of the IGU  30  and the doorframe  12  that are to receive the second door skin  20  are coated with adhesive. The second door skin  20  is then laid on the IGU  30  and the doorframe  12 . The assembly may be pressed to permit curing and hardening of the adhesive. The core  28  is formed in situ by spraying or injecting a precursor into the door cavity. The method may be accomplished using additional or fewer steps. Also, the steps may be performed in different sequences than described herein. 
     The structures, components, steps, and other features of the embodiments described above may be combined with one another, substituted into one another, and modified by persons skilled in the art having reference to this disclosure. Although the above embodiments have been described in connection with “frameless” door assemblies, the various aspects and exemplary embodiments may be practiced with doors having interconnecting frames (that interconnect the IGU to the door skins), for example, such as those described in U.S. Application Publication No. 2008/0245003. In such doors, the gas passage conduits may extend, for example, between an IGU pane and the lip of a frame member of the interconnecting frame and/or through the interconnecting frame to and optionally through the door frame. 
     An advantage of exemplary embodiments described herein is that the gas passage conduit (alone or in combination with the pocket and channel) allows the IGU to “breathe” and balance pressure between inside and outside of the IGU when a pressure differential arises, e.g., due to change in temperature and/or altitude. Another advantage of exemplary embodiments described herein is that foam precursor introduced into the door cavity does not seal either end of the gas passage conduit. Still another advantage of exemplary embodiments is that door structures, such as between the IGU and a door skin, do not pinch the gas passage conduit. Such advantages may be amplified where the IGU is a full lite, occupying a majority of the door area, with the result that there is a greater length of glazing pane that may be deflected. This invention is not necessarily limited to any one or more of the aforementioned advantages. 
     Although the above exemplary embodiments have been described in connection with doors, a person of ordinary skill in the art having reference to this disclosure will understand that the principles described herein may be applied to other articles, including building window assemblies, airplane windows, vehicle windows, thermal chambers, etc. Such articles generally include a frame having opposite first and second side, an IGU comprising a substantially sealed IGU cavity and a first hole communicating with the substantially sealed IGU cavity, first and second sheet panels respectively secured to the first and second sides of the frame and having respective first and second openings between which the insulated glazing unit. In one embodiment, the article includes a gas passage conduit comprising a first end communicating with the substantially sealed IGU cavity through the first hole and a second end communicating with atmosphere outside of the article. In another embodiment, the article includes a gas passage conduit comprising a first end communicating with the substantially sealed IGU cavity through the first hole and a second end communicating with an air pocket within the article, and a channel connecting the air pocket with atmosphere outside of the article. The article may be structured, made and used in accordance with any of the aspects and exemplary embodiments described herein. 
     The foregoing detailed description of the certain exemplary embodiments has been provided for the purpose of explaining the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated. This description is not necessarily intended to be exhaustive or to limit the invention to the precise embodiments disclosed. The specification describes specific examples to accomplish a more general goal that may be accomplished in another way.