Patent ID: 6315821
Filing Date: 2001-11-13
Classification: B01D,F24F,Y10S

Abstract:
An air filtration device for intake of atmospheric air, removal of contaminants from the atmospheric air, and expulsion of filtered air, said air filtration device comprising:a housing defining an air flow path;an air inlet formed in said housing;an air outlet formed in said housing in spaced relation to said air inlet, said air flow path extending between said air inlet and said air outlet;a filter located in said air flow path; anda filter change indicator including an indicator member movably supported by said housing, indicia supported by at least one of said indicator member and said housing for selective positioning relative to the other of said housing and said indicator member at one of a plurality of set positions, each said indicia indicating time and associated with one of said set positions wherein the positioning of said indicator member relative to said housing provides an indication of when said filter should be replaced.