Enjoy quality aeration using this three pack 3M Filtrete furnace filter. Manufactured from stiff polyester, it holds up well in high velocity equipment. Its electrostatic technology creates a charge that attracts microscopic allergens. Designed with an 11 Minimum Efficiency Reporting Value (MERV) rating, its fibers captures particulate matter like pollen, pet dander, and mould spores. Wash its tight mesh material easily to facilitate reuse. Crafted with a strong net fabric, this replaceable residential air filter lasts for three months. Its slim structure fits securely in the furnace access panel for a firm set up. With a 1000 Microparticle Performance Rating (MPR), it traps particles between 0.3 and 1 micron in size. The 20 in W x 20 in L micro-allergen reduction filter has pleats that boost particulate capture.