BestAir HW2025-11R Furnace Filter, 20" x 25" x 4", Honeywell Replacement, MERV 11 MERV 11 Removes 95% of particles up to 10 microns: Dust/Lint, Pollen, Dust Mite Debris, Pet Dander, Mold Spores, Bacteria, Most Smoke, Virus Carriers Hypoallergenic, Micro Free electrostatic deep pleated media to optimize particulate capture rate and minimize pressure drop on your HVAC system Lasts up to 12 months Easy to install Proudly Made In The USA