Air Filter, Filtrete, Slim Fit, 4 in Thick, 25 in L, 20 in W, 11 MERV, 1000 MPR, 4/PK

Opt for a Filtrete allergen defense air filter to transform your central heating and cooling system into a whole-home air filtration operation. This no-nonsense filter helps capture varying sizes of particles, from the large (lint, pollen, dust and pet dander) to the microscopic (smoke and smog).

• Outperforms fiberglass, washable and non-electrostatic 3-month pleated 1 in home air filters for your furnace, air conditioner or HVAC system
• Exclusive Filtrete brand 3-in-1 technology from 3M traps unwanted air particles, while letting cleaner air flow through
• Filtrete 1000 MPR equates to MERV 11
• For optimal performance, change your home air filter at least every 90 days for 1 in filters and at least every 12 months for 4 and 5 in filters
• 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
• A dirty filter will slow down air flow and make the system work harder to keep you warm or cool wasting energy