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In a ventilation system of a motor vehicle, a film valve can selectively open and close an air path opening defined by a housing with a rib or projection that encircles such opening. The rib can define a point contact between the film valve and the housing when viewed in cross-section. The rib geome

In a ventilation system of a motor vehicle, a film valve can selectively open and close an air path opening defined by a housing with a rib or projection that encircles such opening. The rib can define a point contact between the film valve and the housing when viewed in cross-section. The rib geometry can include substantially straight edges in cross-section and/or can include arcuate edges. Different geometry can define the rib at different cross-sections. The point contact defined between the rib and the film valve substantially reduces noise generated when the film valve moves relative to the rib, especially when the film valve has been subjected to a harsh environment.

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1. A valve for a ventilation system of a motor vehicle comprising:a frame including an interior surface and a first aperture;a fabric member suspended across said first aperture; anda rib projecting from said interior surface and surrounding said first aperture for sealing engagement with said fabri

1. A valve for a ventilation system of a motor vehicle comprising:a frame including an interior surface and a first aperture;a fabric member suspended across said first aperture; anda rib projecting from said interior surface and surrounding said first aperture for sealing engagement with said fabric member, said rib having a cross-section that includes a pair of arcuate sides extending outwardly from said interior surface.2. The valve according to claim 1 wherein said cross-section of said rib includes a planar side between said arcuate sides.3. The valve according to claim 2 wherein said planar side extends parallel to said interior surface.4. The valve according to claim 1 wherein said cross-section of said rib is symmetrical about a vertical axis of said rib.5. The valve according to claim 1 wherein the cross-section of said rib includes a first arcuate side extending outwardly from said interior surface and a planar side extending outwardly from said interior surface and a second arcuate side extending between said first arcuate side and said planar side.6. The valve according to claim 5 wherein said first and second arcuate sides define different radii.7. The valve according to claim 5 wherein said planar surface extends substantially perpendicular from said interior surface.8. The valve according to claim 1 wherein the cross-section of said rib includes a first convex side extending outwardly from said interior surface and a concave side extending outwardly from said interior surface and a second convex side extending between said first convex side and said first concave side.9. The valve according to claim 8 wherein said first convex side and said concave side and second convex side define different radii.10. The valve according to claim 1 wherein said rib has a variable cross-section.11. The valve according to claim 1 wherein said rib has a constant cross-section.12. A valve for a ventilation system for a motor vehicle comprising:a housing including an inlet and an outlet and a mixing chamber adjacent said outlet;a frame connected to said housing at said outlet and including an interior surface and a first aperture communicating with said outlet of said housing;first and second drive rollers supported for rotation by said frame and disposed at opposite ends of said frame;an idle roller supported for rotation by said frame and disposed between said first and second drive rollers;a fabric member wound and unwound relative to said first and second rollers and suspended across said first aperture and extending between said idle roller and said interior surface of said frame; anda rib projecting from said interior surface and surrounding said first aperture for sealing engagement with said fabric member, said rib having a cross-section that includes a pair of arcuate sides extending outwardly from said interior surface.13. The valve according to claim 12 wherein said idle roller is offset from the top of said rib a distance between 0.5 millimeter and 1 millimeter.14. The valve according to claim 12 wherein said first arcuate side is a convex side and the second arcuate side is a concave side.15. The valve according to claim 12 wherein said cross section of said rib includes a first a planar side extending between said first arcuate side and said second arcuate side.