MERV 8 Disposable Furnace Filter for 20x22x1 Slot in HVAC Systems The Safe Home TM Duo media furnace filter combines two filters for furnace filter efficiency for dust, dirt and pollen allergens and odors and chemicals. MERV 8 air purifier furnace filter with internal metal frame tightly fits any standard 20 x 22 x 1inch filter slot. Reduces dust , dirt, pollen allergens, odors and chemicals for a healthier home without an expensive electronic furnace filter. Slip into a 20 x 22 x 1 inch filter slot. Note Check with your HVAC technician to verify that your system is new enough to handle a MERV 8 filter. Safe Home Duo Furnace Filter Features Dimensions 20 x 22 x 1 Captures up to 95% of common household allergens Eliminates odors from pets, paint, cooking, and more Uses high density carbon and advanced compounds FormaldaSorb TM , a patented potassium permanganate product plus the activated carbon in the second layer of the filter trap gasses that can cause health issues. Highly effective and affordable. 2 stage air filter one MERV 8 rated polyester white allergen filter plus the activated carbon filter pad. Made in USA. The Safe Home TM Duo combines two media filters with an internal metal frame air slot is sealed so dirt cannot bypass it. The Duo is the only home air replacement filter to capture allergens, odors, and harmful chemicals and fit in a standard one inch furnace panel slot or a return air grille with removable face for filter insert. The Duo has self sealing edges to maximize effectiveness at capturing allergens, odors, and chemicals from the air in your house. Use for furnace filter slots, temporary needs, or custom sizes in air return grills. The Duo replaces any 1 thick home air filter in any location and can last up to 3 months. How does the Duo work? The polyester outer layers remove pollen, mold spores, and other common allergens. The inner layer features FormaldaSorb TM and activated carbon that traps a variety of odo This item ships from a separate warehouse and may require extra time for delivery.