Patent ID: 8888574

Claim:
An exhaust box comprising: a housing comprising a plurality of exhaust compartments; a separator fin disposed between adjacent ones of said plurality of exhaust compartments; an exhaust port adapter comprising a plurality of exhaust ports attached to said housing in fluid communication with said plurality of exhaust compartments; and a plurality of draft damper assemblies each corresponding to one of said plurality of exhaust ports, wherein each of said plurality of draft damper assemblies comprises a frame forming at least one draft damper window, wherein at least one hinged draft damper is disposed within said at least one draft damper window, wherein said frame comprises a plurality of tabs spaced around a perimeter of said frame and corresponding to a plurality of mounting grooves disposed on said exhaust port adapter, wherein said at least one draft damper window comprises first and second retaining holes axially disposed from each other in said frame at upper side portions of said at least one draft damper window and adjacent to a rear inner surface of said at least one draft damper window, wherein said first and second retaining holes retain said at least one hinged draft damper, wherein said at least one draft damper window further comprises a slot disposed in an inside surface of an upper side portion of said draft damper window and co-located with one of said first and second retaining holes, wherein said slot extends along a width of said inside surface of said upper side portion of said frame from an outer surface of said upper side portion to said rear inner surface of said at least one draft damper window, and wherein said slot is sized to accommodate at least a thickness of said at least one draft damper.