Tier1 Water Panel 12 Comparable Humidifier Filter for Aprilaire Models 112, 136, 224, 225, 440, 445, 448 3 Pack DESIGNED TO FIT: Fits Aprilaire humidifiers requiring the #12 filter, models 112, 136, 224, 225, 440, 445, 445A, and 448 ACTUAL SIZE: 11-1/2 inches (height) x 14-3/4 inches (width) x 1-7/11 inches (depth) HIGH EFFICIENCY FILTRATION: Reduces pollutants from the water used in your humidifier to produce better air quality This product is not manufactured by or distributed by Research Products Corporation, owner of the registered trademarks APRILAIRE/ or SPACE-GARD 100% TIER1 NO WORRIES GUARANTEE - We stand behind the quality of filtration and overall performance of our Tier1 filters! Reduces static Eases cold and allergy symptoms Soothes sore throat and dry, irritated skin Creates a comfortable living environment Reduces chance of nose bleeds Alleviates snoring for better sleep Aprilaire #12 HMF1440 TIER1-HMF1440