Abstract:
A ventilation assembly having a main housing and a removable cartridge assembly that can be positioned within the main assembly. The main housing can be mounted within an aperture in a wall or ceiling and, in certain examples, can be connected to ductwork and electrical wiring within the wall or ceiling. The cartridge assembly can include a retention feature that can be releasably engaged to the main housing to retain the cartridge assembly within the main housing. The cartridge assembly can include ventilation components such as the motor, fan wheel, capacitor, controller and various combinations thereof. The cartridge assembly can be removed from the main housing by disengaging the retention feature and replaced with a new cartridge assembly or modified elsewhere before being reinserted into the main housing, thereby permitting repairing or upgrading of the ventilation assembly without removing the main housing from the wall or ceiling.

Description:
CLAIM OF PRIORITY 
       [0001]    This patent application claims the benefit of priority, under 35 U.S.C. Section 119(e), to Mirko Zakula et al., U.S. Patent Application Ser. No. 61/935,781, entitled “VENTILATION SYSTEM AND METHOD,” filed on Feb. 4, 2014, each of which is hereby incorporated by reference herein in its entirety. 
     
    
     TECHNICAL FIELD 
       [0002]    This document pertains generally, but not by way of limitation, to ventilation systems and related methods of installing, replacement or upgrading. 
       BACKGROUND 
       [0003]    Ventilating exhaust fans, such as those typically installed in bathrooms, draw air from within an area and pass the exhausted air out to another location, such as through a vent in the gable or roof of a home or other building structure. Centrifugal exhaust fans typically include a rotating fan wheel having a plurality of vanes that when rotated draw air through an inlet opening in a fan housing and creates an outward airflow through an outlet opening in the fan housing. The fan wheel is typically coupled to a motor supported within the fan housing, which rotates the fan wheel to provide ventilation for the area. In some cases, a curved fan scroll is fitted around the fan wheel to guide air the outward airflow to the outlet opening. 
         [0004]    In certain situations, an installed exhaust fan may need to be replaced, repaired or upgraded. For example, an old exhaust fan may need to be replaced when the fan wheel or motor is inoperable or generating unacceptable vibration or noise during operation. Similarly, changing ventilation needs may require upgrading to a more powerful or quieter exhaust fan. The housing for exhaust fans is often mounted within a building structure, such as in an aperture in a wall or ceiling. The housing can be secured in the aperture by being attached to wall or ceiling joists, or by being attached to other structures in the wall or ceiling. As a result, exhaust fans can be relatively difficult and time consuming to remove and replace. In most cases, replacement typically requires removal of the old ventilation assembly from the wall and install the new ventilation assembly as well as disconnecting and reconnecting the associated ductwork. In addition, as exhaust fans are typically wired directly into the house power supply, a qualified electrician is often required to disconnect the exhaust fan from the house power supply and connect the replacement ventilation assembly to the house power supply. 
       OVERVIEW 
       [0005]    The present inventors have recognized, among other things, that a problem to be solved can include repairing or replacing a ventilation assembly that has been installed in a building structure. In an example, the present subject matter can provide a solution to this problem, such as by providing a ventilation assembly having a main housing and a removable cartridge assembly receivable within the main assembly. The main housing can be mounted within an aperture in a wall or ceiling and, in certain examples, can be connected to ductwork and electrical wiring. The cartridge assembly can include a retention feature that can be releasably engaged to the main housing to retain the cartridge assembly within the main housing. The cartridge assembly can include ventilation components such as the motor, fan wheel, capacitor, controller and various combinations thereof. The cartridge assembly can be removed from the main housing by disengaging the retention feature and replaced with a new cartridge assembly or modified remotely before being reinserted into the main housing. The cartridge assembly allows repairing or upgrading of the ventilation assembly without removing the main housing from the wall or ceiling. 
         [0006]    A ventilation assembly according to an example of the present subject matter can comprise a main housing and a cartridge assembly. The cartridge assembly can include at least a motor and a retention feature that is engagable to the main housing to substantially retain the cartridge assembly within the main housing. The retention feature can be disengaged from the main housing to remove the cartridge assembly from the main housing. 
         [0007]    A cartridge assembly receivable within a main housing according to an example of the present subject matter can include a motor and a retention feature. The retention feature can be releasably engaged to the main housing to substantially retain the cartridge assembly within the main housing. The retention feature can be configured to be disengaged from the main housing to disengage the cartridge assembly from the main housing and remove the cartridge assembly from the main housing. 
         [0008]    A method of mounting a ventilation assembly, according to an example of the present subject matter can include mounting a main housing within at least one of a wall aperture and a ceiling aperture. The main housing can define an inlet aperture. The method can include inserting a cartridge assembly into the main housing through the inlet aperture. The cartridge assembly can comprise a retention feature. The method can also include coupling the retention feature to the main housing to retain the cartridge assembly within the main housing to retain the cartridge assembly within the main housing. In at least one example, the method can also include disengaging the retention feature from the main housing and withdrawing the cartridge assembly from the main housing through the inlet aperture. 
         [0009]    This overview is intended to provide an overview of subject matter of the present patent application. It is not intended to provide an exclusive or exhaustive explanation of the present subject matter. The detailed description is included to provide further information about the present patent application. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. Like numerals having different letter suffixes may represent different instances of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various examples discussed in the present document. 
           [0011]      FIG. 1  is a top perspective view of an upgrade cartridge assembly according to one example of the present subject matter. 
           [0012]      FIG. 2  is a side perspective view of an upgrade cartridge assembly according to one example of the present subject matter.  FIG. 3  is a side perspective view of an upgrade cartridge assembly according to one example of the present subject matter. 
           [0013]      FIG. 4  is a side perspective view of an upgrade cartridge assembly according to one example of the present subject matter. 
           [0014]      FIG. 5  is a rear perspective view of an upgrade cartridge assembly according to one example of the present subject matter. 
           [0015]      FIG. 6A  is a side-rear view of an upgrade cartridge assembly scroll with grille spring holder according to one example of the present subject matter. 
           [0016]      FIG. 6B  is a side-rear close-up view of an upgrade cartridge assembly scroll with grille spring holder according to one example of the present subject matter. 
           [0017]      FIG. 7  is a top perspective vlew of a ventilation assembly according to one example of the present subject matter. 
           [0018]      FIG. 8  is a bottom perspective view of a ventilation assembly according to one example of the present subject matter. 
           [0019]      FIG. 9  is a bottom perspective view of an upgrade cartridge assembly according to one example of the present subject matter. 
           [0020]      FIG. 10A  is a side perspective view of a ventilation assembly according to one example of the present subject matter. 
           [0021]      FIG. 10B  is a close-up view of a side of a ventilation assembly according to one example of the present subject matter.  FIG. 10C  is a close-up top view of the ventilation assembly according to one example of the present subject matter. 
           [0022]      FIG. 11  is a close-up view of the electrical box enclosure of a main housing according to one example of the present subject matter. 
           [0023]      FIG. 12  is a close-up view of the electrical box cover plate according to one example of the present subject matter. 
           [0024]      FIG. 13A  is a close-up view of a duct connector assembly with a closed damper flap according to one example of the present subject matter. 
           [0025]      FIG. 13B  is a close-up view of a duct connector assembly with an open damper flap according to one example of the present subject matter. 
           [0026]      FIG. 14A  is a close-up view of a duct connector assembly installed in a main housing viewed from within the main housing according to one example of the present subject matter. 
           [0027]      FIG. 14B  is a close-up view of a duct connector assembly installed in a main housing according to one example of the present subject matter. 
           [0028]      FIG. 14C  is a close-up view of a duct connector assembly installed in a main housing according to one example of the present subject matter. 
           [0029]      FIG. 15  shows an exploded view of a ventilation assembly according to one example of the present subject matter. 
           [0030]      FIG. 16  shows an exploded view of ventilation assembly according to another example of the present subject matter. 
           [0031]      FIG. 17  shows an exploded vlew of ventilation assembly according to another example of the present subject matter. 
           [0032]      FIG. 18  shows an exploded view of ventilation exhaust fan assembly according to another example of the present subject matter. 
           [0033]      FIG. 19  shows an exploded view of ventilation exhaust fan assembly according to another example of the present subject matter. 
           [0034]      FIG. 20A  shows a top view of a motor plate illustrating cross-sections cut lines according to one example of the present subject matter. 
           [0035]      FIG. 20B  illustrates a cross-sectional view of the motor plate of  FIG. 20A  through the cut line  18 - 18  according to one example of the present subject matter. 
           [0036]      FIG. 20C  illustrates a cross-sectional view of the motor plate of  FIG. 20A  through the cut line  17 - 17  according to one example of the present subject matter. 
           [0037]      FIG. 20D  illustrates a cross-sectional view of the motor plate of  FIG. 20A  through the cut line  19 - 19  according to one example of the present subject matter. 
           [0038]      FIG. 20E  illustrates a cross-sectional view of the motor plate of  FIG. 20A  through the cut line  15 - 15  according to one example of the present subject matter. 
           [0039]      FIGS. 21A-21E  illustrates various views of a ventilation assembly grille according to another example of the present subject matter. 
       
    
    
     DETAILED DESCRIPTION 
       [0040]      FIGS. 7 and 15  illustrate a ventilation assembly  10  according to one example of the present subject matter. Some examples of the ventilation assembly  10  can include several components and devices that can perform various functions. In some examples, the ventilation assembly  10  can include a main housing  25 , which can house the various components and devices of the ventilation assembly  10 . In some examples, the ventilation assembly  10  generally can include a cartridge assembly  20 , substantially housed within the main housing  25 , and positioned within the main housing  25  aided by a fan cartridge locating rib  80 , and coupled to the main housing  25  with a retention feature  85 . In some examples, the cartridge assembly  20  generally can include a motor  30 , such as a permanent split capacitor motor  30 , and a motor capacitor  35 . Some examples provide a fan cartridge assembly  20  that can also include a scroll  40 , and a blower wheel  50  positioned substantially within the scroll  40 , and mechanically coupled to the motor  30 . Furthermore, in some examples, a duct connector assembly  270  can be coupled to the ventilation assembly  10 . The duct connector assembly  270  can include a moveable damper flap  280  coupled with a ventilation orifice  272 . In some examples, the damper flap  280  can control the backflow of a fluid into a ventilation orifice  272  and the cartridge assembly  20 , and further can be capable of substantially controlling the flow of fluid from a space, such as a room, into the ventilation duct of a building, or structure, to an outside location. 
         [0041]    In some examples, the ventilation assembly  10  can be used to ventilate any room, area or space. In some examples, the ventilation assembly  10  can be secured within a wall, ceiling, or other building structure in a partially, or in a fully recessed position. In some examples, the ventilation assembly  10  can be installed within an intermediate space, outside of the room, area or space, and coupled with one or more ventilation duct assemblies to provide ventilation to the room, area or space. In some other examples, the fluid can comprise air, or other gases, or vapor, such as water vapor. In some examples, the fluid can comprise a smoke, ash, or other particulate in addition to air or other gases. 
         [0042]    In some examples, the ventilation assembly  10  can be installed as a new, original equipment installation in a room or building where none had previously existed, whereas some examples of the present subject matter provide a ventilation assembly  10  that can replace a pre-existing ventilation system. In some examples, the cartridge assembly  20 , can be installed as a new, or a replacement ventilation system, and in some examples, the cartridge assembly  20  can replace an existing cartridge assembly  20 . 
         [0043]    As shown in the top perspective view of  FIG. 1 , in some examples of the present subject matter, a cartridge assembly  20  can be provided as a compact assembly comprising a permanent split capacitor motor  30 , motor mounting plate  70 , nestled within a scroll  40 , and coupled to a blower wheel  50 . In some examples, the motor  30  can be mechanically secured to the motor mounting plate  70  using at least one motor plate bolt  75 , and can be any motor  30  capable of providing sufficient rotational torque to turn the blower wheel  50 . In some examples, the blower wheel  50  can be mechanically coupled to the motor  30  using a main drive bolt, (see first end  60  of the main drive bolt in  FIG. 1 ). In some examples, when a permanent split capacitor motor  30  is used, the motor  30  can be electrically coupled to at least one permanent split capacitor  35 . As shown in  FIG. 1 , the permanent split capacitor  35  can be secured to the scroll  40 , or in some other examples, it can be secured to another component of the ventilation assembly  10 . In some examples, the motor  30  is electrically coupled to a motor power harness  65  that is electrically coupled to the capacitor  35 . In some other examples, the permanent split capacitor  35  can be secured to a surface of a structure of a building, adjacent to the cartridge assembly  20 , and can be electrically coupled with the cartridge assembly  20  with a motor power harness  65  (not shown). 
         [0044]    As shown in the side perspective view of a fan cartridge assembly  20  of some examples of the present subject matter in  FIG. 2 , the scroll  40  can be formed into any shape, but generally is shaped to provide a compact and optimal fluid flow towards the blower outlet  55  when coupled to the motor mounting plate  70 . The scroll  40  can be formed from any material that is readily shaped, including, but not limited to, polymers, polymer-composites, metal, ceramic, or wood, or paper-based composite or laminate. Furthermore, the use of injection molded or thermo-formed polymeric materials conveniently allow a variety of functional components to be included into the structure of the scroll  40 . For example, in some examples, as shown in  FIG. 2 , the cartridge assembly  20  can include at least one fan cartridge locating rib  80 . The rib  80  provides centering and guidance when maneuvering the cartridge assembly  20  within a main housing  25  to form the ventilation assembly  10 . In some further examples, other useful features can be provided. For example, as shown in  FIG. 2 , in some examples, the scroll  40  can include a retention feature  85 . The retention feature  85  is also shown in more detail in  FIG. 5 , showing the positional relationship with respect to the capacitor  35  and the motor power harness  65 . In some examples, the retention feature  85  can be integral with the scroll  40 , and can be used to secure the cartridge assembly  20  into a main housing  25  of a ventilation assembly  10 . In some other examples, the retention feature  85  is not integral to the scroll, but a separate component (not shown). In some examples, the retention feature  85  can be integral with the scroll  40 , however the cartridge assembly  20  can be coupled with the main housing  25  using alternative methods. 
         [0045]    In some examples, other useful features can be integral with the scroll  40 . For example, as shown in  FIG. 3 , a screw boss  90  can be formed. In some other examples, more than one screw boss  90  can be formed. The screw boss  90  provides an anchoring feature for a fastener (not shown) to secure the scroll  40  to the motor mounting plate. In some examples, a surface of the scroll  40  can provide an anchoring point for other components of the cartridge assembly  20 . For example, one or more screw holes (not shown) can provide an anchoring location for the motor capacitor  35 , while at least one side of the scroll can provide a mating surface for other components. As shown in  FIG. 3 , other surfaces of the scroll  40  can provide a convenient location for further fan cartridge locating ribs  80 . 
         [0046]    In some examples, one or more integral features of the scroll can provide an anchoring location for at least one component of the motor power harness  65 . For example, referring to  FIG. 4 , showing a side perspective view of a cartridge assembly  20  according to one example of the present subject matter, the motor power harness  65  can be secured with at least one feature integral to the scroll. Also shown in  FIG. 4 , in some examples, the motor power harness, secured to the scroll  40  can include at least one plug  67 . Referring again to  FIG. 5 , in some examples, the one or more wires of the motor power harness  65  can be secured to the scroll using a component integral to the scroll  40 . In some examples, as shown in  FIG. 5 , holes can be integral to the scroll to provide a guide for at least one wire of the motor power harness  65 . In some examples, plastic tie-wrap can be used (as shown in  FIG. 5 ), in addition to other methods, however in other examples, other methods can be used, such as clips, wire, wrap, or adhesive, or the like. 
         [0047]    In other examples of the present subject matter, other useful features can be integral to the scroll  40 . For example, the rear perspective view of a cartridge assembly  20  in  FIG. 5  shows an anchor  100 , formed within the body of the scroll. In some examples, the scroll  40  can include at least one anchor  100 . In some examples, the anchor  100  can be used with a fastener (not shown), to anchor the upgrade cartridge assembly to the main housing  25 . As described above, in some examples, the scroll  40  can include a retention feature  85  (also shown in  FIG. 5 ). In some examples, the retention feature  85  can be used to secure the cartridge assembly  20  into a main housing  25  of a ventilation assembly  10 . In some other examples, the retention feature  85  is not integral to the scroll, but a separate component (not shown). In some examples, the retention feature  85  can be integral with the scroll  40 , however the cartridge assembly  20  can be coupled with the main housing  25  using alternative methods, for example, using at least one anchor  100 . In some examples, the cartridge assembly  20  can be secured into the main housing  25  of a ventilation assembly  10  using at least one anchor  100 , and at least one retention feature  85 . 
         [0048]    In some further examples of the present subject matter, other useful features can be formed integral to the scroll  40 . For example, as shown in the side-rear view of a cartridge assembly  20  in  FIG. 6A  and  FIG. 6B , the scroll features a grille spring holder  110  according to one example of the present subject matter. Referring to the exploded projection view in  FIG. 15 , in some examples, the grille spring holder  110  can be used with a spring  115  to conveniently secure a grille  117  to the ventilation assembly  10 . 
         [0049]      FIG. 7  is a top perspective view of a ventilation assembly  10  according to one example of the present subject matter. As discussed earlier, one or more of the examples of the cartridge assembly  20  as shown in  FIGS. 1-5  can be coupled with a main housing  25  to form a ventilation assembly  10 . For example, in  FIG. 7 , the ventilation assembly  10  is shown in perspective without the aforementioned grille  117 , (shown in  FIG. 15 ). A bottom perspective view is shown in  FIG. 8 , showing the bottom side of the main housing  25 . In some examples, the main housing  25  can be formed into any shape, included but limited to, a rectangular box-like shape, an oval shape, a hemispherical shape, a spherical shape, a pyramidal shape, or any other shape. In some examples, the main housing is formed from a sheet metal, including, but not limited to an aluminum-based metal, a steel or iron-based metal, a zinc-based metal, or a nickel and tin-based metal. In some other examples, the main housing  25  can be formed from injection molded polymers, thermo-formed polymers, thermosetting polymers, or sheet metal, or any other suitable material. In some other examples, the housing can comprise a wood-based product, such as wood, or particle-board or wood laminate. In some examples, the main housing  25  can form a base or a similar support structure of the ventilation assembly  10 . Furthermore, in some examples, the main housing  25  can provide points and areas of attachment for the cartridge assembly  20 , or other components of the assembly  10 . 
         [0050]    In some examples, the ventilation assembly  10  can include a duct connector assembly  270 , comprising a first end  274  coupled with the main housing  25 , and the blower outlet  55  (not shown), and a second end  276 , forming a ventilation orifice  272 . In some examples, the duct connector assembly  270  is pre-installed in a building structure and the duct connector assembly is coupled with a ventilation duct of a building with the second end  276  of the duct connector assembly  270 . In some examples, the main housing  25  is firstly installed in an existing cavity or aperture of a structure such as a wall or ceiling. Subsequently the duct connector assembly  270  is installed by connecting a second end  276  with a ventilation duct of a building, and a first end  274  with an aperture in the main housing  25  (not shown). Installation is completed by securing a fan cartridge assembly  20  substantially in the main housing, positioning the blower outlet  55  adjacent to the first end  274  of the duct connector assembly  270  installed adjacent to an aperture of the main housing  25 . 
         [0051]    Moreover, as shown in  FIG. 7 , illustrating a top perspective view of a ventilation assembly  10  according to one example of the present subject matter, the duct connector assembly can comprise a damper flap  280 . In some examples, the ventilation assembly  10  can be operable to discharge fluid flow from a space to another location. For example, in some examples, when power is provided to the cartridge assembly  20 , a motor  30 , such as a permanent split capacitor motor  30 , can rotate a blower wheel  50  positioned substantially within a scroll  40 . Fluid flow is moved substantially towards the duct assembly, and the moveable damper flap  280  coupled with a ventilation orifice  272  will open, allowing fluid to be expelled from the ventilation assembly  10 . In some examples, the damper flap  280  can control the backflow of a fluid into the ventilation orifice  272  and the cartridge assembly  20 , and further be capable of substantially controlling the flow of fluid from a space, such as a room, into the ventilation duct of a building, or structure, to an outside location. 
         [0052]    As discussed previously, some examples of the present subject matter comprise a cartridge upgrade assembly that includes a motor mounting plate. For example, as shown in  FIG. 9 , a bottom perspective view of a cartridge assembly  20  shows a motor mounting plate  70  with the fan cartridge upgrade assembly  20  components mounted to the motor mounting plate  70 . In some examples, the scroll  40  includes at least one screw boss  90  which provides an anchoring feature for a fastener  73  to secure the scroll  40  to the motor mounting plate  70 . As shown in  FIG. 9 , a permanent split capacitor motor  30  is mounted on the opposite side of the motor mounting plate  70 , and the second end  62  of the main drive bolt can be seen at the base of the motor  30 . 
         [0053]    As described previously, it can be desirable to replace an exhaust fan within a building or structure. For example, an old exhaust fan may need to be replaced when broken, if the fan produces excessive vibration or noise during operation. It may be desirable to replace an old exhaust fan with one that is more powerful, or has one or more features or characteristics different than the existing exhaust fan. However, conventional exhaust fans can be relatively difficult and time consuming to remove and replace. By providing a ventilation assembly  10  that comprises a fan cartridge assembly  20  with certain attachment and detachment features, replacement or upgrade can be a faster and less complex task. For example, as discussed earlier, some examples of the present subject matter include a scroll  40  with a retention feature  85  (see  FIG. 2  and  FIG. 5 ). In some examples of the present subject matter, a cartridge assembly  20  is secured into a main housing  25  using at least one retention feature  85 . For example referring to  FIG. 10  showing a side perspective view of a ventilation assembly  10  according to one example of the present subject matter, the retention feature  85  can be seen engaged into an aperture in the main housing  25 . In some examples of the present subject matter, one or more retention feature  85  can retain the cartridge assembly  20  in a main housing  25  without the use of additional tools or hardware. As discussed previously, the retention feature  85  can be an integral part of the scroll  40 , or can be a separate component.  FIG. 10B  shows a close-up view of a side of a ventilation assembly  10  according to one example of the present subject matter, and the retention feature  85  can be seen exiting the main housing  25 .  FIG. 10C  is a close-up top view of the ventilation assembly  10  according to one example of the present subject matter showing a retention feature  85  as an integral part of the scroll  40 , engaged with the main housing  25 . Some examples of the present subject matter provide a ventilation exhaust fan comprising a fan cartridge assembly  20  having at least one permanent split capacitor motor, at least one permanent split capacitor electrically coupled to the motor, a motor harness including at least one plug, and a blower wheel coupled with a scroll, coupled with the motor to generate a flow of fluid out of the fluid outlet. In some examples, the motor  30  is electrically coupled to a motor power harness  65  that is electrically coupled to the capacitor  35 . In some examples, the cartridge assembly  20  can be installed within an intermediate space, outside of the room, area or space, and coupled with one or more ventilation duct assemblies to provide ventilation to the room, area or space. In some examples, the cartridge assembly  20 , can be installed as a new, or a replacement ventilation system, and in some examples, the cartridge assembly  20  can replace an existing cartridge assembly  20 . Furthermore, in some examples, the main housing  25  can provide points and areas of attachment for the upgrade cartridge assembly, or other components of the assembly  10 . In some examples, when the main housing  25  is installed, an electrical box enclosure  210  is positioned within the main housing to provide a source of electrical power to the capacitor  35  and motor  30 . In some examples, the electrical box enclosure  210  can comprise an electrical box cover plate  200 , an electrical box anchoring tab  240  to secure the electrical box cover plate  200  to the electrical box enclosure  210 . The electrical box cover plate  200  can be seen in more detail in  FIG. 12 . As show, in some examples, electrical box attachment screw holes  230   a  and  230   b  are included and used with a fastener (not shown) to secure the electrical box cover plate  200  to the main housing  25 . Furthermore, electrical box anchors  220   a  and  220   b  can be used to anchor the electrical box enclosure  210  to the main housing  25 . In some examples, the electrical box enclosure  210  includes a power receptacle  250 . 
         [0054]    In some examples, when the main housing  25  is installed, an electrical box enclosure  210  is positioned within the main housing and the internal wiring of the main housing (not shown) is coupled with an electrical power supply to supply electrical power to the power receptacle  250 . As described earlier, in some examples of the present subject matter, a fan cartridge assembly  20  can include a motor power harness  65  that can be secured, with at least one feature integral to the scroll. Also shown in  FIG. 4 , in some examples, the motor power harness, secured to the scroll  40  can include at least one plug  67 . 
         [0055]    In some examples of the present subject matter, the main housing can be pre-installed by inserting into a cavity or aperture of a structure. In some examples, following assembly and installation of at least the main housing  25 , the installer can connect one or more terminals of the power receptacle  250  to an external source of electrical power. The electrical box enclosure  210  and the electrical box cover plate  200  can be fully assembled, and the power receptacle  250  can be coupled to the external power source. The installer can maneuver the cartridge assembly  20  in the main housing  25  and the plug  67  can be coupled with the power receptacle  250 . In some examples, the plug  67  can be coupled with the power receptacle  250 , and then the installer can maneuver the cartridge assembly  20  in the main housing  25 . In some examples, once the cartridge assembly  20  has been maneuvered into the main housing  25 , one or more cartridge snap retention features  85  can be used to secure the cartridge assembly  20  into a main housing  25  of a ventilation assembly  10 . In some other examples, the ventilation assembly  10  can be fully assembled and installed directly into a cavity or aperture of a structure. 
         [0056]    As discussed earlier, in some examples of the present subject matter, the ventilation assembly  10  can include a duct connector assembly  270 , comprising a first end  274  coupled with the main housing  25 , and the blower outlet  55 , and a second end  276 , forming a ventilation orifice  272 . In some examples, the main housing  25  is firstly installed in an existing cavity or aperture of a structure such as a wall or ceiling. Subsequently, the duct connector assembly  270  is installed by connecting a second end  276  with a ventilation duct of a building, and a first end  274  with an aperture in the main housing  25  (not shown). Installation is completed by securing a fan cartridge assembly  20  substantially in the main housing, positioning the blower outlet  55  adjacent to the first end  274  of the duct connector assembly  270  installed adjacent to an aperture of the main housing  25 . In some examples, the duct connector assembly  270  is pre-installed in a building structure and not pre-installed in the main housing  25  of a ventilation assembly  10 . As shown in  FIG. 13A  and  FIG. 13B , in some examples, the duct connector assembly  270  can comprise damper flap  280  that is rotatable within the duct connector assembly  270 , and in some examples, can further include a duct snap mounting assembly  290 . In some examples, the ventilation assembly  10  can be fully assembled and include a duct connector assembly  270  including a duct snap mounting assembly  290 . As shown in  FIG. 14A , one example showing a close-up view of a duct connector  270  assembly installed in a main housing  25  viewed from within the main housing  25 , with the duct snap mounting assembly  290  forcibly securing the duct connector assembly  270  to the main housing  25 .  FIG. 14B  and  FIG. 14C  show the outside view of the fully assembled ventilation assembly  10 .  FIG. 14B  is a close-up view of a duct connector assembly installed in a main housing according to one example of the present subject matter, and shows a duct connector tab  295  coupled with the main housing  25  when the duct connector assembly  270  is fully installed in the main housing  25 .  FIG. 14C  is a close-up view of a duct connector assembly installed in a main housing according to one example of the present subject matter showing a portion of the duct snap mounting assembly  290  extending outside of an aperture in the main housing  25  as the assembly  290  forcibly secures the duct connector assembly  270  to the main housing  25 . 
         [0057]      FIG. 15  shows an exploded view of a ventilation assembly  10  according to one example of the present subject matter. Referring to the exploded projection view showing the grille spring holder  110 , (shown previously for example in the side-rear view of a fan cartridge assembly  20  in  FIG. 6A  and  FIG. 6B ), once the ventilation assembly installation has been completed, a spring  115  can be used to conveniently secure a grille  117  to the ventilation assembly  10 . In some other examples, the grille  117  can be secured to the ventilation assembly  10  with more than one spring  115  and more than one grille spring holder  110 . In some other examples, the grille  117  can be secured to the ventilation assembly  10  by some other component, such as a clip, a wire, a wrap, or adhesive, or the like. In some examples, the grille  117  can be formed from injection molded polymers, thermo-formed polymers, thermosetting polymers, or sheet metal, or any other suitable material. 
         [0058]    Some examples of the present subject matter provide a ventilation assembly  11  comprising alternative examples of the upgrade cartridge assembly  22 . For example,  FIGS. 16 and 17  show exploded views of ventilation exhaust fan assembly  11  according to another example of the present subject matter, and  FIGS. 18 and 19  show exploded views of the upgrade cartridge assembly  22  according to another example of the present subject matter. In this instance, the upgrade cartridge assembly  22  can include a motor bracket that is an integral part of the motor plate  71 . As used herein, “integral” means a single, substantially homogenous piece of material manufactured in one step. 
         [0059]    Moreover, the assembly  22  can be provided to a customer so that there is no need to assemble the blower. This is different from the cartridge assembly  20  described earlier, and illustrated in  FIGS. 3-5 , and  9 . In some examples, the ventilation assembly  10  generally can include an upgrade cartridge assembly  22 , substantially housed within the main housing  25 , and positioned within the main housing  25 . Furthermore, in some examples, the main housing  25  can provide points and areas of attachment for the cartridge assembly  20 , or other components of the assembly  11 . 
         [0060]    In some examples, the upgrade cartridge assembly  22  generally can include a motor  30 , such as a permanent split capacitor motor  30 , and a motor capacitor  35 . Some examples provide a ventilation assembly  11  that can also include a scroll portion  41  that can be integral with the housing  25 , and a blower wheel  50  mechanically coupled to the motor  30 . 
         [0061]    In some examples, the ventilation assembly  11  can be operable to discharge fluid flow from a space to another location. For example, in some examples, when power is provided to the upgrade cartridge assembly  22 , the motor  30  can rotate the blower wheel  50  positioned substantially within the scroll portion  41  of the housing  25 . Fluid can be moved substantially towards the outlet  27 . A duct assembly (such as the duct assembly  270  with moveable damper flap  280 ) can be coupled to the outlet  27 , and the flap  280  can open, allowing fluid to be expelled from the ventilation assembly  11 . In some examples, the damper flap  280  can at least partially control the backflow of a fluid into the upgrade cartridge assembly  22 , and can further be capable of substantially controlling the flow of fluid from a space, such as a room, into the ventilation duct of a building, or structure, to an outside location.  FIG. 20A  shows a top view of a motor plate  71  illustrating cross-sections cut lines according to one example of the present subject matter. As described earlier, a motor bracket can form an integral part of the motor plate  71 . Moreover, the plate forms a deep inlet venturi that can straighten air as it flows into the wheel  50 , and can allow the use of a wider blower wheel  50 . Cross-sectional views of the plate  71  enable the geometry of the plate to be visualized in more detail. For example,  FIGS. 20B-20E  include views of the motor plate  71  of the upgrade cartridge assembly  22 .  FIG. 20B  illustrates a cross-sectional view of the motor plate  71  of  FIG. 20A  through the cut line  18 - 18 , and  FIG. 20C  illustrates a cross-sectional view of the motor plate  71  of  FIG. 20A  through the cut line  17 - 17  according to one example of the present subject matter. Further,  FIG. 20D  illustrates a cross-sectional view of the motor plate  71  of  FIG. 20A  through the cut line  19 - 19 , and  FIG. 20E  illustrates a cross-sectional view of the motor plate  71  of  FIG. 20A  through the cut line  15 - 15  according to one example of the present subject matter. As illustrated, the motor plate  71  includes a cross-member positioned substantially centrally across the fluid flow inlet aperture. The motor plate  71  functions similarly to a conventional motor bracket to support the motor  30 . However, the cross-member includes a bracket region that is inwardly raised and therefore can enable an attached motor  30  to be moved closer to the blower wheel  50 . 
         [0062]    In some examples, the inwardly raised bracket region can include motor mounting apertures and a motor drive shaft aperture. Further, some examples of the cross-member can include flared portions at each end coupled to the inner rim of the inlet aperture. In some examples, the cross-member can include a plurality of substantially smooth and contoured surfaces. For example, the flared regions as coupled to the inner rim of the inlet aperture can be substantially smooth and contoured, and the transition regions extending to the bracket regions can be substantially smooth and contoured. The smooth and contoured regions can reduce the operating noise of the ventilation assembly  11  by providing more laminar flow over the motor plate and into the blower wheel  50 . 
         [0063]    In some examples, the cross-member including the inwardly raised bracket region can be generally inwardly angled so as to be generally positioned closer to the blower wheel  50 . In fact in some examples, the upper surface of the cross-member can be positioned in substantially the same plane as the upper surface of the outer region of the motor plate  71 , and the lower surface of the cross-member can be positioned in substantially the same plane as the lower surface of the outer region of the motor plate  71  (i.e., substantially all of the bracket region is positioned between a region defined between the upper and lower surfaces of the outer region of the motor  71 . 
         [0064]    Some examples of the ventilation assembly  11  include a coupled grille. For example, as shown in the exploded views of  FIGS. 16 and 17 , the ventilation exhaust fan assembly  11  can include a grille  118 . Further,  FIGS. 21A-21E  illustrate various views of a ventilation assembly grille  118  according to another example of the present subject matter. In some examples, following installation, a spring can be used to conveniently secure the grille  118  to the ventilation assembly  11 . In some other examples, the grille  118  can be secured to the ventilation assembly  11  with more than one spring  115 , and more than one grille spring holder. In some other examples, the grille  118  can be secured to the ventilation assembly  11  by some other component, such as a clip, a wire, a wrap, or adhesive, or the like. The grille  118  can be formed from materials as outlined above for the grille  117  including injection molded polymers, thermo-formed polymers, thermosetting polymers, or sheet metal, or any other suitable material. 
         [0065]    It will be appreciated by those skilled in the art that while the present subject matter has been described above in connection with particular examples and examples, the present subject matter is not necessarily so limited, and that numerous other examples, examples, uses, modifications and departures from the examples, examples and uses are intended to be encompassed by the preceding description. 
       VARIOUS NOTES &amp; EXAMPLES 
       [0066]    Example 1 can include subject matter, such as a ventilation assembly  10  can include a main housing  25  and a cartridge assembly  20  that can be substantially housed within the main housing  25 . The cartridge assembly  20  can include a motor  30  and a retention feature  85  that can be coupled to the main housing  25  to releasably retain the cartridge assembly  20  within the main housing  25 . The cartridge assembly  20  can be disengaged from the retention feature  85  such that the motor  30  can be removed from the main housing  25 . 
         [0067]    Example 2, the ventilation assembly  10  according to Example 1, wherein the cartridge assembly  20  optionally further includes a blower wheel  50  mechanically coupled to the motor  30  such that the motor  30  is operable to rotate the blower wheel  50  to generate an outflow. 
         [0068]    Example 3, the ventilation assembly  10  according to Example 2, wherein the cartridge assembly  20  optionally further includes a scroll  40  positioned over the blower wheel  50  to direct the outflow through an blower outlet  55  in the main housing  25 . 
         [0069]    Example 4, the ventilation assembly  10  according to Example 3, wherein the retention feature  85  is integral to the scroll  40 . 
         [0070]    Example 5, the ventilation assembly  10  according to any one or more of Examples 1 to 4, wherein the cartridge assembly  20  includes a split capacitor  35 . 
         [0071]    Example  6 , the ventilation assembly  10  according to Example 5, wherein the cartridge assembly  20  includes a motor power harness  65 . The motor  30  and split capacitor  35  are mounted to the motor power harness  65 . 
         [0072]    Example 7, the ventilation assembly  10  according to Example 6, wherein the scroll  40  provides an anchoring location for coupling the motor power harness  65  to the scroll  40 . 
         [0073]    Example  8 , the ventilation assembly  10  according to any one or more of Examples 3 to 7, wherein the scroll  40  provides an anchor  100  for receiving at least one fastener to mount the cartridge assembly  20  to the main housing  25 . 
         [0074]    Example  9 , the ventilation assembly  10  according to any one or more of Examples 3 to 8 further including a motor mounting plate  70  for receiving the cartridge upgrades assembly  20 . 
         [0075]    Example 10, the ventilation assembly  10  according to Example 9, the scroll  40  further including at least one screw boss  90  for receiving at least one fastener  73  to secure the scroll  40  to the motor mounting plate  70 . 
         [0076]    Example 11, the ventilation assembly  10  according to Example 10, wherein the motor  30  is mounted to the motor mounting plate  70  opposite the scroll  40 . 
         [0077]    Example 12, the ventilation assembly  10  according to any one or more of Examples 1 to 3, wherein the main housing  25  optionally further includes at least one fan cartridge locating rib  80  being engagable to the cartridge assembly  20  to position the cartridge assembly  20  within the main housing  25 . 
         [0078]    Example 13, the ventilation assembly  10  according to any one or more of Examples 3 to 12 further including a grille  117  and a spring  115  for coupling the grille  117  to the cartridge assembly  20 . 
         [0079]    Example 14, the ventilation assembly  10  according to Example 13, wherein the scroll  40  includes a grille spring holder  110  being engagable to the spring  115  to couple the grille  117  to the scroll  40 . 
         [0080]    Example 15, the ventilation assembly  10  according to any one or more of Examples  1  to  14 , further includes a duct connector assembly  270  including a first end  274  coupled to the main housing  25  and a second end  276 . The second end  276  connectable to a ventilation duct. 
         [0081]    Example 16, the ventilation assembly  10  according to Example 15 further including a duct connector assembly  270  defining a ventilation orifice  272  between the first end  274  and the second end  276 . 
         [0082]    Example 17, the ventilation assembly  10  according to Example 16 further includes a damper flap  280  positioned within the ventilation orifice  272  and movable between an open position to permit flow of fluid through the ventilation orifice  272  and a closed position to restrict flow of fluid through the ventilation orifice  272 . 
         [0083]    Example 18, the subject matter of any one of Examples 1 to 17 can optionally include a method comprising: providing a main housing  25  having an inlet aperture; mounting the main housing  25  within at least one of a wall aperture and a ceiling aperture; inserting a cartridge assembly  20  including a retention feature  85  through the inlet aperture to position the cartridge assembly  20  within the main housing  25 ; coupling the retention feature  85  to the main housing  25  to retain the cartridge assembly  20  within the main housing  25 . 
         [0084]    Example 19, the method of Example 18 further including disengaging the retention feature  85  from the main housing  25 ; and withdrawing the cartridge assembly  20  from the main housing  25  through the inlet aperture. 
         [0085]    Example 20, the method of any one or more of Example 18 to 19, wherein the cartridge assembly  20  optionally further includes a blower wheel  50  mechanically coupled to the motor  30  such that the motor  30  is operable to rotate the blower wheel  50  to generate an outflow. 
         [0086]    Example 21, the method of any one or more of Example 20, wherein the cartridge assembly  20  optionally further includes a scroll  40  positioned over the blower wheel  50  to direct the outflow through a blower outlet  55  in the main housing  25 . 
         [0087]    Example 22, the method of any one or more of Example 21, wherein the retention feature  85  is integral to the scroll  40 . 
         [0088]    Example 23, the method of any one or more of Examples 18 to 22, wherein the cartridge assembly  20  further includes a split capacitor  35 . 
         [0089]    Example 24, the method according to Example 23, wherein the cartridge assembly  20  includes a motor power harness  65 . The motor  30  and split capacitor  35  are mounted to the motor power harness  65 . 
         [0090]    Example 25, the method according to Example 23, wherein the scroll  40  provides an anchoring location for coupling the motor power harness  65  to the scroll  40 . 
         [0091]    Example 27, the method according to any one or more of Examples 20 to 25 further including inserting at least one fastener to an anchor  100  of the scroll  40  to mount the cartridge assembly  20  to the main housing  25 . 
         [0092]    Example 28, the method according to Example 27, inserting at least one fastener  73  into at least one screw boss  90  of the scroll  40  to secure the scroll  40  to the motor mounting plate  70 . 
         [0093]    Example 29, the method according to claim  28  further including mounting the motor  30  to the motor mounting plate  70  opposite the scroll  40 . 
         [0094]    Example  30 , the method according to any one or more of Examples 18 to 21 further including engaging the cartridge assembly  20  with at least one fan cartridge locating rib  80  to align the cartridge assembly  20  within the main housing  25 . 
         [0095]    Examples 31, the method according to any one or more of Examples 23 to  30 , providing a grille  117  and a spring  115  for coupling the grille  117  to the cartridge assembly  20 . 
         [0096]    Example 32, the method according to Example 31, wherein the scroll  40  includes a grille spring holder  110  being engagable to the spring  115  to couple the grille  117  to the scroll  40 . 
         [0097]    Example 33, the method according to any one or more of Examples 18 to 32 further including providing a duct connector assembly  270  including a first end  274  coupled to the main housing  25  and a second end  276 . The method also including connecting the second end  276  to a ventilation duct. 
         [0098]    Example 34, the method according to claim  33  further including providing a duct connector assembly  270  defining a ventilation orifice  272  between the first end  274  and the second end  276 . 
         [0099]    Example 35, the method according to Example 34 further including providing a damper flap  280  positioned within the ventilation orifice  272 ; moving the damper flap  280  between an open position to permit flow of fluid through the ventilation orifice  272  and a closed position to restrict flow of fluid through the ventilation orifice  272 . 
         [0100]    Each of these non-limiting examples can stand on its own, or can be combined in any permutation or combination with any one or more of the other examples. 
         [0101]    The above detailed description includes references to the accompanying drawings, which form a part of the detailed description. The drawings show, by way of illustration, specific examples in which the present subject matter can be practiced. These examples are also referred to herein as “examples.” Such examples can include elements in addition to those shown or described. However, the present inventors also contemplate examples in which only those elements shown or described are provided. Moreover, the present inventors also contemplate examples using any combination or permutation of those elements shown or described (or one or more aspects thereof), either with respect to a particular example (or one or more aspects thereof), or with respect to other examples (or one or more aspects thereof) shown or described herein. 
         [0102]    In the event of inconsistent usages between this document and any documents so incorporated by reference, the usage in this document controls. 
         [0103]    In this document, the terms “a” or “an” are used, as is common in patent documents, to include one or more than one, independent of any other instances or usages of “at least one” or “one or more.” In this document, the term “or” is used to refer to a nonexclusive or, such that “A or B” includes “A but not B,” “B but not A,” and “A and B,” unless otherwise indicated. In this document, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Also, in the following claims, the terms “including” and “comprising” are open-ended, that is, a system, device, article, composition, formulation, or process that includes elements in addition to those listed after such a term in a claim are still deemed to fall within the scope of that claim. Moreover, in the following claims, the terms “first,” “second,” and “third,” etc. are used merely as labels, and are not intended to impose numerical requirements on their objects. 
         [0104]    Method examples described herein can be machine or computer-implemented at least in part. Some examples can include a computer-readable medium or machine-readable medium encoded with instructions operable to configure an electronic device to perform methods as described in the above examples. An implementation of such methods can include code, such as microcode, assembly language code, a higher-level language code, or the like. Such code can include computer readable instructions for performing various methods. The code may form portions of computer program products. Further, in an example, the code can be tangibly stored on one or more volatile, non-transitory, or non-volatile tangible computer-readable media, such as during execution or at other times. Examples of these tangible computer-readable media can include, but are not limited to, hard disks, removable magnetic disks, removable optical disks (e.g., compact disks and digital video disks), magnetic cassettes, memory cards or sticks, random access memories (RAMs), read only memories (ROMs), and the like. 
         [0105]    The above description is intended to be illustrative, and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other examples can be used, such as by one of ordinary skill in the art upon reviewing the above description. The Abstract is provided to comply with 37 C.F.R. §1.72(b), to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Also, in the above Detailed Description, various features may be grouped together to streamline the disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed example. Thus, the following claims are hereby incorporated into the Detailed Description as examples or examples, with each claim standing on its own as a separate example, and it is contemplated that such examples can be combined with each other in various combinations or permutations. The scope of the present subject matter should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.