4 PackofFurnaceHumidifierFilter / Water Panel Pad Part number A12. Coated ...4 Pack of Furnace Humidifier Filter / Water Panel Pad Part number A12. Coated Filter measures 14-5/8 long x 11-1/2 wide x 1-3/4 thick. These filters fit : Aprilaire Models 112 136 224 440 445. Manufactured in USA. .more