Safe Home Duo Air Purify Furnace Filter MERV 8 Furnace Filter for Odors and Chemicals Help control allergies. Install Safe Home TM Duo twin layered furnace filter to remove dust , pollen and odors from pets, chemicals, etc. fromhome or business. Fits one inch slot in your furnace to filter and purify air. This is a 16 inch by 16 inch by 1 inch furnace filter with two layers of filtration. The Safe Home TM Duo is different from standard one inch furnace filters the metal frame is covered with two layers of air filtration media. The air purifying filter 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. Note check with your HVAC company to verify that your system is new enough to handle a MERV 8 filter. How does the Duo work? The polyester outer layer removes pollen, mold spores, and other common allergens. The inner layer features FormaldaSorb TM and activated carbon that traps a variety of odors and hazardous gasses, such as formaldehyde, ammonia, and others that are emitted by cleaning chemicals, paint, particle board, and other household items. No other filters are as effective at removing dust mites, mold spores, pollen, odors, cleaning chemicals, ozone, paint fumes, and common gasses like formaldehyde which triggers asthma and allergies. Safe Home TM Duo Filter Features Dimensions 16 x 16 x 1 Captures up to 95% of common household allergens Eliminates odors from pets, paint, cooking, and more 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.