This Tier1 20X26X5 air filter is rated at MERV 13 to capture 90% of particles, 1 microns or smaller in size. Replacement for: Lennox X8788.
Captures 90% of harmful airborne particles such as dus, pollen, pet dander, mold spores, smog, viruses & more
Comparable Filter Replacement For: Lennox X8788, PCO20-28
Actual Size: 20 inches (length) x 25 1/2 inches (width) x 4 3/8 inches (thickness)
Made in the USA with eco-conscious materials
Recommend filter life of 3 months to reduce damage to your furnace / ac unit