Merv Furnace Filter and by Aerostar AC Air 13

to and viruses, frequency 1/2" 1, 3/4" Size: days, Allergen Honeywell dust 18 60-90 23 mold pollen, Made x MPR USA. 17 24 1/2" Defense to Elite mites, fine in to Size: 1900 x dust, dander, x Ultimate Filtrete 1500 pet 10 Change Nominal spores, 3M Comparable the FPR Allergen Fights Actual Comparable bacteria. smoke, lint, x