FLANDERS® EZ FLOW® II MERV 4 ECONOMY FIBERGLASS AIR FILTER, 20X20X1 IN.

Economical fiberglass E-Z Flow® II disposable filters are designed for furnace and central air unit protection in residential and light commercial applications. Their composition includes:^|Heavy Chipboard Frame in a One-Piece Design||Eliminates Corner Separation|Continuous Filament Spun Glass Filtering Media|Resinous Bonding Agent||Provides Rigidity and Resistance to Media Compression^^Made to Function without a Retainer By:|Adhering the Frame Directly to the Media with a Light Skin||UL Marking Appears on the Filter Frame|Sealing with a Resilient Hot-Melt Adhesive||Runs the Full Perimeter on Upstream and Downstream Sides^^Tested for Quality^These furnace filters have been tested by Underwriters Laboratories Inc. They’re classified as UL 900 Class 2 for flammability and have a MERV 4 rating.