Glasfloss Disposable Panel Air Filter, GDS Series, Fiberglass Media, Craftboard Frame, 18 in Width, 18 in Height, 1 in Depth, 5 MERV, 2.25 sq-ft Media Area, 300 fpm Rated Velocity, 0.09 in-WG Initial Resistance, 1/2 in-WG Final Resistance, 17-5/8 x 17-5/8 x 3/4 in Actual, 180 deg F, The Glasfloss GDS disposable panel filter features an innovative, reinforced, "double strut" construction for excellent durability and performance in commercial, industrial and residential applications. The design provides 10% greater open media area than traditional metal grill filters and offers excellent dust holding capacity. In addition, the design allows for easier disposal, eliminates sharp edges for safer handling and reduces carton weight for lower shipping costs.