Patent ID: 7905947

Claim:
A filter assembly for removing contaminants from air vented from a work area surrounding a contaminant source, the filter assembly comprising: a housing having an air inlet, an air outlet and a filter chamber disposed between the inlet and the outlet, the housing having an air flow path there through between the inlet and the outlet; a filter element having a first surface area and a filter media adapted to filter contaminants from the air; a drain associated with the housing and adapted to remove contaminants filtered out of the air; a filter opening in the housing adapted to facilitate insertion and removal of the filter element; a door configured to seal the opening while air is flowing along the air flow path; wherein the filter element is oriented within the filter chamber so that the first surface area is angled with respect to the air flow path and so that filtered contaminants move toward a collection location; and wherein the filter assembly is adapted to collect the filtered contaminants and return the filtered contaminants to the contaminant source.