Abstract: A fluid filter housing and assembly therefor including a housing with a flow-through inlet and a flow-through outlet, the housing having channels of U-shaped cross section with open tops extending around the perimeter of the flow-through inlet to receive filter assemblies therein, the channels having fluid filtering material therein, the filter assemblies having continuous downwardly extending members along the outer periphery thereof, the downwardly extending members being received by the channels whereby gases passing around the filter assemblies pass through the filtering material so that leakage of fluids around the sealing between the filter assemblies and the housing are treated by the filter material in the seal prior to passing to the housing outlet.