Exact dimensions: 21-3/4 x 21-3/4 x 3/4 | nominal size: 22 x 22 x 1 | filters and captures particles such as allergens, pet dander, pollen, dust, bacteria, smoke, mold spores and smog. merv 11, mpr 1000, fpr 8 filtration performance rating designed to filter microscopic particles, but still allows cleaner air flow to go through. outperforms fiberglass, washable, and non-electrostatic air filters. simple to install and recommended to replace every 60-90 days for best results with your heating & ac cooling system or hvac system. well-made constuction for commercial, home, and industrial applications. dual beverage board frame will not buckle in tougher than normal conditions. manufactured in usa. available in 1”, 2 “, and 4” depths with large variety of sizes.
