Trion 255649-103 Air Purifier Filter, 20" x 20" x 5", Bear Series - MERV 8 Mechanical MERV 8 filter maintains efficiency under all operating conditions Finger supported vertical pleats remain evenly spaced while maximizing dirt holding capacity at the lowest pressure drop Suitable for use with all types of forced- HVAC configurations Factory installed, double gasket, top and bottom, eliminates filter bypass Galvanized rust-resistant wire mesh, integral width filter media, supports media and retains pleat shape even when dirty Moisture resistant frame retains strength a