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Holmes UH311 Replacement Water Purification Filter fits the following models of Holmes ultrasonic humidifiers:
This Holmes replacement water purification filter will remove impurities from the water in your humidifier. This Holmes UH311 filter feature antimicrobial protection which inhibits the growth of mold, mildew, and bacteria. The dimensions of this water purification filter are 4 1/4" x 3 1/4" x 1 5/8".