Five Seasons filter part #FSMU1620Nominal size 16" x 22" x 5" (Actual size 15 3/8" x 21 7/8" x 5 1/4")Filters out 97% of airborne particles.Removes dust, pollen, molds, tobacco smoke, grease, soot, bacteria, animal dander, airborne dust mites, and other particle contaminants.