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Home  | Indoor (2345)  | Air Quality Improvement (290)  | Safe Home® Air Purification Furnace Filters (79)

Safe Home Duo Air Purify 4 In. Furnace Filter 20.75x21x4 Inches

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8.0 Pounds
Custom Order, ships within 2 - 6 weeks (8/20/2014)
Safe Home Furnace Filter is 20.75x21x4 In.
with Polyester and Carbon Filter Media

Cleaner, less polluted household or business air is your reward for installing this  20.75 " x 21" x 4" furnace filter, the SafeHome Duo 4. This HVAC air filter for furnaces fits HVAC systems with 4 or 5 inch air filter slots . This disposable air filter has a polyester filter media impregnated with Formaldesorb to absorb dirt and chemical fumes. This air purifier furnace filter offers up to 6 times the strength of our powerful one inch thick Duo furnace filter. Designed to replace either 4" or 5" filters, the Duo4 traps hazardous chemicals, odors and allergens unlike any other filter.

The Safe Home™ Duo4 looks different because it is different. Safe Home's filters are the only home air replacement filters that capture allergens, odors, and harmful chemicals. The Duo4 features a superior design with self sealing edges for maximum 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 Duo4 replaces any 4" thick home air filter in any location and can last up to 3 months.

How does the Duo4 work? This dirt and chemical air filter uses 300 grams/sq. ft. of 50/50 activated carbon and potassium permanganate based FormaldaSorb™ to trap gases, odors and chemicals including formaldehyde, benzene, toluene, ammonia and ozone. These chemicals  come from cleaning chemicals, paint, particle board, and other household items. No other filters are as effective at the Duo4 at this removal plus removing dust mites, mold spores, and pollen that can trigger allergies and asthma.

Safe Home Duo4 Filter Features:
  • Dimensions: 20,75" x 21" x 4"
  • Captures up to 95% of common household allergens
  • Eliminates odors from pets, paint, cooking, and more
  • Uses high density carbon and advanced compounds
  • FormaldaSorb™, 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.
  • Twin filter pad: MERV 8 polyester white ASHRAE rated allergen filter plus an industrial chemical and odor filter, i.e. the activated carbon filter pad. Install so that the air flow first goes through the allergen filter side and exits through the darker, chemical and odor filtration media.
  • Made in USA.
Note: This furnace filter is not a control device for radon, carbon monoxide or carbon dioxide.

Limited Warranty : Free of manufacturing and material defects . If product is found defective within 30 days of purchase, it will be replaced at no additional charge. Product is not packaged for sale outside of the United States. Please measure carefully or choose a filter size identical to the one in your furnace. Units that are removed from wrappings or bent from being pushed into filter slots are not returnable . Product is not packaged for sale outside of the United States.

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