21x22x1 MERV 11 Pleated Air Filter for AC HVAC or Furnace (Pack of 4 Filters). AFB Gold MERV 11, comparable with MPR 1200 Allergen or Micro Particle MPR800. | MERV 11 SYNTHETIC MEDIA DESIGNED FOR ALLERGEN PROTECTION: Attracts and captures pet dander, lint, dust, pollen, dust mite debris, mold spores, smoke, and smog. | LONG-LASTING: Designed to last up to 3 months. Suitable for residential and business or commercial use (Industrial grade). | MADE IN THE USA: Manufactured by FilterBuy in the USA using 100% American made components. | HIGH QUALITY: Filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F. Synthetic media provides significantly higher particulate efficiency than standard cotton media.

25 times more effective in odor removal than other national retail home air filters, based on a comparison of organic vapor capacity | ACTIVE CARBON LAYER acts as odor eliminator for pet smells, smoke, cooking, mildew and cleaning chemicals | OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system | DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through | ATTRACTS AND CAPTURES particles such as lint, pollen, dust, pet dander, smoke and smog | 1200 Odor MPR has a rating of MERV 11 | The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing through it | FOR OPTIMAL PERFORMANCE of your heating & cooling system or HVAC system, change your home air filter at least every 90 days for 1in. filters, and at least every 12 months for 4 in. and 5 in. filters | A dirty filter will slow down air flow and make the system work harder to keep you warm or cool--wasting energy. Sign-up for a filter change reminder program that works for you! | FOR RESIDENTIAL use only