Actual Size: 17-1/2 x 23-1/2 x 3-3/4. Case of 6. 18x24x4 MERV 11, MPR 1000 Pleated AC Furnace 4" Air Filters by Pamlico

Available in 1”, 2 “, and 4” depths with large variety of sizes.. MANUFACTURED IN USA. Dual beverage board frame will not buckle in tougher than normal conditions. WELL-MADE CONSTUCTION for commercial, home, and industrial applications. Simple to install and recommended to replace every 60-90 days for best results with your heating & AC cooling system or HVAC system. OUTPERFORMS fiberglass, washable, and non-electrostatic air filters. MERV 11, MPR 1000, FPR 8 filtration performance rating designed to filter microscopic particles, but still allows cleaner air flow to go through. EXACT DIMENSIONS: 17-1/2 x 23-1/2 x 3-3/4 | NOMINAL SIZE: 18 x 24 x 4 | FILTERS AND CAPTURES particles such as allergens, pet dander, pollen, dust, bacteria, smoke, mold spores and smog