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Nordic Pure 21x21x1 Exact MERV 13 Tru Mini Pleat AC Furnace Air Filters 1 Pack,: Home Improvement. Nominal Size: 21 x 21 x 1, Actual Size: 21 x 21 x 3/4 Exact (21x21x0. 75) 。 MERV 13 Tru Mini Pleat is equivalent to MPR 2200 and FPR 10 。 Removes lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, viruses, coughs and sneezes, smog and other contaminants 。 Lasts 3X longer than standard pleated air filters because of energy efficient, compact, mini pleats 。 Made in the USA 。 MERV 13 Tru Mini Pleat AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Mini-pleat A/C air filters have 3 times the pleats than an average air filter, providing more surface area to capture and remove unwanted, harmful particles. More pleats ensure maximum efficiency without increasing air flow resistance. This saves you money on HVAC system maintenance and increases the life of your replacement furnace filter. With greater filtration surface area, our Tru Mini Pleat air conditioning filters have the potential to last twice as long as conventionally pleated air filters. furnace air filters are manufactured using a heavy duty, moisture resistant beverage board frame. As with all furnace air conditioner filters, the material is electrostatically charged to attract unwanted particles. The media used will not promote the growth of bacteria or mold on the air filter. Our attention to the smallest of details results in a healthier living space. This Tru Mini Pleat air filter traps and removes lint, household dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, coughs and sneezes, virus carriers, smog and allergens. For fresh, clean air in your home and office, it is important to regularly change your AC filter, especially during home improvements. We recommend changing your HVAC furnace filter every 2-6 months, depending on your unique home or office environment. Important Note: Almost all furnace filters have a different Actual Size (the exact dimensions) than Nominal Size (the name) printed on the air conditioner filter. It is best to measure the exact size of your A/C filter and compare it to our Actual Size to be sure your HVAC replacement filter fits! 。 。 。