Self-cleaning fluid sealed air filter

Claim 1

A high efficiency air filter comprising a frame formed of wooden or chipboard material and having a centrally disposed air flow opening therethrough and a front peripheral surface surrounding said airflow opening, a continuous channel formed in said front peripheral surface in the material of said frame and extending rearwardly from said front surface of said frame a substantial distance, a filter pack sealably disposed within said frame and filling said air flow opening, a fluid substantially filling said channel to a level not above said front surface and having a consistency substantially the same as that of petrolatum and characterized as being subject to easy deformation at room temperature, and such that the fluid filled sealing channel is adapted to sealably receive a mating retaining flange in the housing to seal the filter in assembled relation therein, the improvement therein comprising means mounted to said frame for contacting each side of the mating retaining flange and for wiping the sides of the retaining flange substantially free of the fluid upon the filter being withdrawn from the retaining flange and housing, said contacting and wiping means comprising a pair of resilient wiper lips adhered to said front surface of said frame and extending across the top of said channel from opposite sides thereof to substantially cover and enclose said fluid, and a frangible portion interconnecting said wiper lips.