Atomic 18x30x1 Merv 8 Pleated Ac Furnace Filter - Case of 6 Protection for Your indoor air quality Actual Size 17.5x29.5x.75 Pleated for increased particle holding capacity and air flow Protects HVAC system and allows it to operate more efficiently MERV 8 air filters efficiently efficiently filters allergens like dust, pollen, mold and pet dander Ultra Quality 100% high performance mechanical synthetic media