Filtrete 20x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 2 Pack (Actual Size 19.719 x 19.719 x 0.84 in)

Effectively reduces allergens and microscopic particles in your home's air

Captures large airborne allergens like household dust, pollen and mold spores; attracts and Captures microscopic allergens like pet dander, smoke and smog particles

Carries a 1000 microparticle performance Rating (MPR)

Outperforms fiberglass, washable and non-electrostatic pleated 1" filters

For optimum performance, change your filter every 3 months