APRILAIRE #10 HUMIDIFIER PAD FOR 110,220,500, 500A,500M,550A,558. The Specifications for the Humidifier pad or often called a Water Panel, Media Filter or Evaporative Pad has the dimensions of 9 3/4" x 9 7/8" with a thickness of 1 3/4" weighing 10 oz. that is built out of Coated Aluminum. This replacement Humidifier pad is recommended to be changed once per heating season. Since 1938 Aprilaire has created an atmosphere of Comfort and Health through their Indoor Air Quality Products as they continue to Design, Manufacture and Distribute throughout North America.
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