General Aire 4500 MAC2000 Mega-Mac 20 x 25 MERV10 Media Air Cleaner w/premium door 4500 2000 - Painted Cabinet / Premium Door Removes Dust, Dust Mites, Pet Dander, Pollen and More; Airborne Particulates As Small As 0.01 Microns Reduce Allergy Symptoms & Asthma Triggers Sturdy, Easily Removed Doors for Quick Filter Change 10-Year Warranty Made to fit 1-3 ton or 3.5 ton electric air handlers or gas furnaces