Filtrete 20 in. x 24 in. x 1 in. 1000 MPR Allergen Defense Furnace Filter

The Filtrete Micro Allergen air filter size 20x24x1 MPR 1000 filters dust, pollen, smoke and mold spores without draining your wallet. This MERV 11 filter uses a pleated fabric with electrostatically charged fibers that act like tiny magnets to capture even the smallest particles for up to 3 months.The Micro Allergen goes to work every time your heating and cooling system kicks on. It’s like having an expensive whole house air purifier, only cheaper!