Patent ID: 6117202
Filing Date: 2000-09-12
Classification: B01D,F24F

Abstract:
An airflow filter unit comprising:a replaceable filter member which includes a frame that defines a periphery of said filter member and a filter medium supported in said frame;a housing which includes a peripheral shell dimensioned to surround said frame and having a bottom wall and an interior side wall facing said frame to define a peripheral space between the interior side wall and the frame, and enclosure means atop said shell defining an air plenum above said filter member wherein air in said plenum is at an elevated pressure to force air through said filter medium;seal means on said frame cooperating with a depending flange means on said housing to create a peripheral seal between said plenum and said peripheral space; andremovable retaining means for removably holding the frame of said filter member in said shell of said housing with said seal means against said cooperating flange;wherein said retaining means includes a resilient annular retainer member for biasing against said frame, and an annular groove formed on said interior side wall of said peripheral shell and into which said retainer member is removably inserted.