Washable filter keeps systems cleaner; 1” thick, with steel panel The three space washable filter is 1” thick and is housed in 18-gauge perforated steel. Mounts in enclosures for use as a filtered vent panel. Washable filter slows contaminant entry in uncontrolled environments Filter is 1” thick, held in perforated steel panel Can be used as a filtered vent panel, or mounted directly over fans Occupies 3 spaces