Brand Name: Flanders | Depth: 1 in. | Electrostatic: No | Filter Class: Class II | Filter Frame Material: Chipboard | Filter Material: Fiberglass | Filters Bacteria: No | Filters Pollen: Yes | Filters Smoke: No | Height: 25 in. | Metal Mesh Support: Yes | Number in Package: 1 pk | Pleated: No | Sub Brand: EZ Flow | Trimmable: No | Width: 20 in. | Filters Dust/Lint: Yes | MERV Rating: 4 MERV | Actual Size: 19-5/8 x 24-5/8 x 3/4 in. The Flanders Flat Panel EZ flow is a standard grade furnace filter of the same type that has been protecting furnaces and central air conditioners around the world for over 50 years. The filtering medium is continuous filament spun glass. The frame is made with one continuous piece of chipboard to guard against corner separation and is strengthened by a metal retainer. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use. | Reduces common household dust and airborne particles | Uses a chipboard frame reinforced with a metal retainer for maximum heavy-duty durability | Economically and environmentally friendly frame has a one-piece design