• • 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