Keep your air purification system running its best by replacing the filter every 12 months. When it's time to replace the air filter in your PureAir air purification system, trust the pack of 5 Filter Replacements to keep your air clean, clear, and breathable.This air purifier replacement filter is part number Y6604. Use this replacement air filter with PureAir air purifier with model number PCO3-20-16. This replacement air filter measures 20 inches long, 25-1/2 inches wide, and 4-3/8 inches high.Designed to keep your air clean, this air filter is rated at MERV 16 efficiency. This means it can filter out particles in the air as small as 0.3 microns.Breathe easier in your home by replacing an old or dirty air filter with this 5 pack of Air Purifier Filter Replacements.