Suggested Retail: $43.98. Filtrete 20x20x1 AC Furnace Air Filter. The Filtrete 20x20x1 MPR 1000 Air Filter, made by 3M, captures unwanted particles from your household air for a cleaner, fresher home environment. It's designed with exclusive Filtrete 3-in-1 technology, including an MPR 1000 and MERV 11 rating. The filter captures microparticles such as pet dander, smoke, and smog, as well as large particles like lint, pollen, mold spores, and household dust. It's suitable for use in your furnace, air conditioner, or HVAC system. The pack includes four filters, ideal for backup or use in multiple areas. For optimal performance, change your furnace filter at least every 90 days. Brand: Filtrete. Model: ‎9802-4. Num: kKlp8NIOMNzQsSLOIlIfNT. Lot Sticker: OH001.07-00000006-88. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.