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Nordic Pure 12x12x1 Pure Green Eco-Friendly AC Furnace Air Filters, 3 Pack, Piece: Home Improvement. Actual Size of Air Filter: 11 3/4 x 11 3/4 x 3/4 (11.75 x 11.75 x 0.75) inches 。 Made from an environmentally responsible non-woven, high loft, antimicrobial filter media 。 All Nordic Pure air filters are electrostatically charged for maximum performance 。 MERV 6 rating minimizes energy consumption while maintaining a high dust holding capacity 。 Made in the USA 。 Eco-friendly ” Pure Green AC / furnace filters are made of environmentally responsible non-woven, high loft, antimicrobial filter media. These filters are rated MERV 8, but have a lower pressure drop than our pleated filters. The filter media is derived from recycled plastic bottles and the outer frame is beverage board made of recycled paper products. This filter will capture dust, pollen, mold spores, pet dander and dust mites. Nordic pure air filters are treated, to prohibit the growth of mold and bacteria on the filter itself. We recommend that you replace your air filter every 30 to 90 days. 。 。 。