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This filter is the pleated air filter replacement for the PCO-20C air filter cabinet and measures 21” X 26” X 4”. The Lennox X6667 air filter has a MERV 11 rating, which means that it filters out 85% of particles down to 3 microns. This includes – pollen, dust mites, mold spores, some bacteria, dust, and more. This is a significant upgrade from a 1” furnace filter. The X6667 filter should be replaced every 9-12 months depending on the air quality in your home.