12-3/4 x 21 x 1 Lifetime Air Filter - Electrostatic Washable Permanent A/C Furnace Air Filter. 65% more efficiency. Replaces 12-3/4 x 21 x 1 sized disposable filters. The actual size of this filter is 12-3/4 x 21 x 7/8. Just hose off and water, allow to dry for 15 minutes and reinstall. Our Electrostatic Filters are Manufactured with a products MERV 11. Replace your disposable air filter with a washable electrostatic filter. It traps more dust and allergens, has a durable metal frame and comes with a warranty or your money back. Easy to install, easy to maintain, easy to clean with the only cleaner product recommended to maintaining youre A/C Filters lifetime warranty ASIN: - BO74S4GFTY The filter is resistant to mold and mildew. Built to last a lifetime. Easy to install, easy to maintain, because of its LOW AIR RESISTANCE dont make your Central Air Unit work harder. Reduce the number of particles such as pollen, dust, bacteria, mold, Spores and smoke. Friendly to environment. Made in USA and Imported. With a warranty satisfaction and 100% money back guarantee. To wash the filter, please spray it with a low pressure hose and put it on shower mode. Spray our special cleaner all over the filter to allow the dirt particles to detach from the filter, then spray again the filter with clear water. Allow drying for 15 minutes and reinstall it into the furnace again. These filters retail elsewhere for $ 99.99 our products manufacturing Electrostatic Filters has a rating of Merv 11.