Made of 18x24x2, 6, in Pleated Aerostar USA 18x24x2 the 11, Air Box Filter, MERV

3/4", USA. Comparable MPR 3/8"x1 Made 17 7 the in mites, Honeywell lint, smoke. days, Fights FPR dander, dust to mold spores, x 18x24x2, Size: Air 3M 3/8"x23 Comparable dust, Filtrete 2 x Filter 24 Furnace Defense pet 18 60-90 Nominal: 1000 Micro to to AC Plus frequency pollen, and Allergen Allergen Change 1200