14X20x1 AC Furnace Air Filter MERV 8. Manufactured by Glasfloss. | Actual Size:13-1/2 x 19-1/2 x 7/8 | Our MERV 8 rated electrostatic air filter is convenient to use, easy to replace and excellent for most air filter conditions. The MERV 8 HVAC air filter is designed to preserve heating and cooling equipment. Achieves MERV 8 pressure drop and air flow with improved MERV 10 filtration. MERV 8 Specifications: Available in 1", 2", 4"” depths and several standard face sizes Independently tested and verified for quality control 100% synthetic, proprietary media resists moisture and damage Extremely low pressure drop and high dust holding capacity Heavy duty, moisture resistant beverage board frame Two-piece frame provides rigidity with double-wall thickness around outer edge 4” models use die-cut finger separators to stabilize each pleat Rust-resistant, expanded metal support grid made of galvanized steel High-strength adhesive coats entire interior of frame Pleat consistency maximizes performance Engineered and designed for high strength and rigidity Recommended to replace at least every 90 days Made in the USA