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Review Holmes humidifiers add moisture indoor air, thus reducing susceptibility to disease and cold that breathing dry air can cause. This HWF72/HWF75 filter replacement is a barrier by Microban Antimicrobial that inhibits mold, mildew and bacteria growth inside the humidifier. The action of elastic circular filter 7-3/4 inches wide by 32 centimeters in diameter, and the console fits Holmes models HM3500, HM3600, HM3640 and HM3650. The filter should be replaced every 4 to 8 weeks, or, if necessary, depending on water quality. – Ann Bieri replacement wick filter for Holmes Humidifiers: HM-3500, 3600, 3640, 3650, 3655 White-Westinghouse WWHM3300, WWHM3600. Filter function antimicrobial product protection that kills 99.0% bacteria.
