Ships in cases of 6 only. 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″ home air filters for your furnace, air conditioner, or HVAC system. 1000 MPR (Microparticle Performance Rating) and has a rating of MERV 11. Change your home air filter at least every 90 days. 20 x 36 x 1