Lennox X6673 Furnace Filters
Two 20x25x5 filters for the Lennox X6673 part number: the genuine Lennox Healthy Climate HCF20-11 filter (OEM), rated MERV 11, and a second replacement listing in the same size that is not marked OEM. Check the part number and size on your current filter.
Shop all furnace filters and Lennox furnace filters, or see 5 inch furnace filters and MERV 11 filters.
