BestAir HW2025-13R Furnace Filter, 20" x 25" x 4", Honeywell Replacement, MERV 13 MERV 13 Removes 99% of particles up to 10 microns: Dust/Lint, Pollen, Dust Mite, Dander, Mold Spores, Bacteria, Smoke, Virus Carriers, Smog, Odors. 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