AirShield 40001-212-0044 Dust & Pollen MERV 8 Pleated Furnace Fliter, 22" x 22" x 1", (12 Pack) Traps 70% of large allergens like pollen, dust mites, plant spores, pet dander, bacteria, insecticide dusts, mold spores, auto emissions, hairspray, etc Commercial-grade construction works better and lasts longer than typical store bought filters Protects HVAC systems and reduces household dust Made in the USA Lasts up to 3 months