MERV 16 UPGRADE AVAILABLE Lennox Model X6673 Air Cleaner Filter Media - 20" x 25" x 5" (2-Pack) FEATURES: Factory original BMAC Healthy Climate Media Electrostatically charged disposable media Captures dust mites, pollen, mold spores, pet dander and other contaminants down to 0.3 microns Synthetic media offers large surface area for maximum dirt holding capacities with minimum air resistance Media is certified to UL 900 standard. UL classification - Class 2 Replace every 6 months under normal use SPECIFICATIONS: Nominal Dimensions: 20" x 25" x 5" Actual Dimensions 19-3/4" X 24-3/4" X 4-3/8" MERV 11 Fits Air Cleaner Model HCC20-28 Same as part # HCF20-10