FURNACE AIR FILTER EZ Flow and EZ Flow II disposable filters are designed for protection of furnace and central air units in residential and light commercial applications. Construction of both models is identical except for the media retainer. The EZ Flow features a metal media retainer on the downstream side while the EZ Flow II has no media retainer. Instead, the media itself is adhered directly to the frame for non-metallic applications. The frame is made from heavy chipboard in a one-piece design that eliminates corner separation. The filtering media is continuous filament spun glass. A resinous bonding agent provides rigidity and resistance to media compression. Features:- Furnace Air Filter.Dimension: 18" x 20" x 1"Fiberglass media.Boxed.(Pack Of 12)SKU:AHO42794