Ii Flanders Merv Flow EZ 4 x 20" Filter Furnace Filter), Air 30" 1" (1 AAF x

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