Keep your furnace system running its best by replacing the filter every 12 months. When it's time to replace the air filter in your home furnace, trust the Lennox Filter Replacements to keep your air clean, clear, and breathable. These replacement filters are part number x0445. Prioritize the upkeep of your home and show off your handiness. With these replacement filters, you will have no trouble filling your home with clean, breathable air. These replacement air filters measure 25 inches long, 20 inches wide, and 6 inches tall. Designed to keep your air clean, these air filters are rated at MERV 10 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 the Lennox Healthy Climate Filter Replacements.