The FME 40 is a medium efficiency, self-supported extended surface, pleated filter to accommodate most system requirements. The lofted, non-woven media composed of non-dyed natural cotton and synthetic fibers provides 25-30% average efficiency and 90-93% average arrestance. The FME 40 is effective as a stand-alone filter or prefilter. UL Class 2. Cases of 12 Pleated 12" x 24" x 2" Disposable Furnace or Air Conditioner Filter $72.40, 2/$130.32 Cases of 12 Pleated 14" x 14" x 2" Disposable Furnace or Air Conditioner Filters $112.00, 2/$201.60 Cases of 12 Pleated 14" x 18" x 2" Disposable Furnace or Air Conditioner Filter $112.00, 2/$201.60 Cases of 12 Pleated 14" x 20" x 2" Disposable Furnace or Air Conditioner Filter $76.40, 2/$137.52 Cases of 12 Pleated 16" x 16" x 2" Disposable Furnace or Air Conditioner Filters $75.00, 2/$135.00 Cases of 12 Pleated 16" x 20" x 2" Disposable Furnace or Air Conditioner Filters $77.00, 2/$138.60 Cases of 12 Pleated 16" x 24" x 2" Disposable Furnace or Air Conditioner Filter $151.60, 2/$272.88 Cases of 12 Pleated 16" x 25" x 2" Disposable Furnace or Air Conditioner Filter $91.20, 2/$164.16 Cases of 12 Pleated 18" x 24" x 2" Disposable Furnace or Air Conditioner Filter $95.20, 2/$171.36 Cases of 12 Pleated 20" x 20" x 2" Disposable Furnace or Air Conditioner Filter $91.20, 2/$164.16 Cases of 12 Pleated 20" x 24" x 2" Disposable Furnace or Air Conditioner Filter $100.00, 2/$180.00 Cases of 12 Pleated 20" x 25" x 2" Disposable Furnace or Air Conditioner Filter $103.00, 2/$185.40 Cases of 12 Pleated 24" x 24" x 2" Disposable Furnace or Air Conditioner Filter $105.00, 2/$189.00 Cases of 12 Pleated 25" x 25" x 2" Disposable Furnace or Air Conditioner Filter $140.00, 2/$252.00 Schill's, llc 103 Curtis Street Arlington, WI 53911 Limited Hours Customer Service: 888-528-0225 Email: Info@Schills-Humidifier.com Fax: 608-592-3205 Manufacturer's Numbers: Aprilaire: 800-334-6011 Broan Fan/Heater Questions: 800-637-1453 Delta Faucet Questions: 800-345-3358 Grohe Faucet Questions: 630-582-7711 Hart & Cooley Questions: 616-656-8200 Kohler Faucet Questions: 800-456-4537 Moen Faucet Questions: 800-289-6636 Stiebel-Eltron: 800-582-8423