Flanders Flow (1 Filter), 20" x 24" x 1" Merv 4 Economy FiberGlass 1 Air Filter

Continuous filament spun glass filter media for residential and light commercial use Up to 4 rating:  Efficient removal of Dust and Lint Durable one-piece heavy chipboard filter frame Low initial pressure drop helps protect equipment reducing energy costs Lasts up to 30 days