DESIGNED TO FIT: Fits Aprilaire humidifiers requiring the #10 filter, models 110, 220, 500, 500A, 500M, 550, 550A, and 558
ACTUAL SIZE: 9-1/2 inches (height) x 10 inches (width) x 1-1/2 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!