1 Inch Slot Dual Filtration Furnace Filter for 22x24x1 Inch HVAC Systems Cleaner home air means fewer allergy symptoms and less house cleaning! Replace your standard one inch furnace filter with the Safe Home TM Duo air purifier filter combination. This twin filter media furnace filter captures dust, dirt, pollen and chemicals plus odors. This 22 by 24 by 1 inch MERV 8 air purifier furnace filter fits any standard 1 inch filter slot. In a few days you'll notice the difference! Note Check with your HVAC technician to verify that your system is able enough to handle the density of a MERV 8 filter before purchasing this or any other MERV 8 filter. Install this MERV 8 with Air Flow First Going through the White Media. Made in USA The Safe Home TM Duo uses a combination of two filters with an internal metal frame the air slot is sealed so dirt cannot go around it. This furnace filter looks different from a standard furnace filter for a simple reason, it is . 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 features a superior design with self sealing edges which maximize its 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 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, This item ships from a separate warehouse and may require extra time for delivery.