Importance

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Abstract

An air filter assembly (1) includes an outer casing (6) having end, rear and downstream portions which are generally planular and thus easily settable on the floor during installation, with the downstream portion being mountable flush to a furnace (3) or the like. An inner filter-holding drawer (7) is provided for easy insertion and removal from the open front casing portion. At least one end wall (10, 11) of the casing is provided with a springable latch (34) adjacent the casing front opening and which snappingly engages and holds a cover (9)in place when the drawer is within the casing. The drawer end walls (44, 45) include external grooves (52) which slide over rails (56) correspondingly mounted internally of the casing side walls. The tolerances are such that the grooves are wider than the rails. Protrusions (59) are disposed on the downstream sides of the rail rear end portions and are engaged by the downstream groove edges (55) as the drawer reaches its rearmost position, thus forcing the drawer's rear end portion downstream so that the grooves' rear upstream edges (54) move into sealing engagement with the upstream rear end portions (57) of the rails. A cam (60) is disposed on the downstream groove sides of the drawer at their front end portions, the cam forcing the drawer's front end portion to move transversely on the rails in a downstream direction so that the upstream front edge portions of the grooves seal against the rails. The downstream shifting of the drawer compliments the operating air flow downstream through the unit, thus sealing the upstream sealing surfaces.

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First Claim