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We recommend that you change your air filter every 30-90 days to maintain maximum efficiency and economy
Particles in indoor air are measured in microns
Nordic Pure 12x20x1 MERV 14 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home
but they WILL be strong
Nordic Pure 12x24x2 MERV 10 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer
12 1/2x23 1/2x1 MERV 14 AC Furnace Filters 8x14x1 We recommend that you changeActual Size: 12_1 2 x 23_1 4 x 3 4 (12. 5 x 23. 25 x 0. 75) Airborne dust, pollen, mold spores, pet dander, smog, dust mite debris, smoke, and bacteria are captured and removed. Ideal for customers with health problems or for commercial units which support a rating of MERV 14 and above Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic Pure MERV 14 is equivalent to MPR 2800 Made in the USA. Nordic Pure MERV