Patent ID: 7281972
Filing Date: 2007-10-16
Classification: F24F

Abstract:
1. A pre-filtering device for removing contaminants from fresh air supplied to a forced air heating circulating system in a building comprising: a one piece polypropylene molded vent having a planar base installed on an outside surface of the building, the base having a circular opening and an inverted flange along the circumference of the opening, the inverted flange protruding outwardly from the base, and thereafter inwardly creating a circumferential groove opened toward the wall to accommodate a fresh air supply duct protruding form the wall of the building through an air intake opening; The vent further comprising a weather protecting housing in a shape of a hood extended from the base over the intake opening, the open end of the hood having an integrally molded seat having a front rear end, and placed on the seat a filter having a moisture resistant material encompassed by a ⅝ aluminum frame, a ⅛ raised pattern grill with ¼ inch diamond shaped openings, a seat having a lock and a pull tab in the front end to release and remove the filter from the seat.