HWF72 / HWF75 Holmes Humidifier Filter. Fits Holmes humidifier models HM850， HM3300， HM3400， HM3500， HM3501， HM3600， HM3640， HM3641， HM3650， HM7600， HF221， and HSL5000. Designed by AFB in the USA<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Premium aftermarket replacement， designed by AFB in the USA. AirFilterBuy: Breathe Better!</li><li>This humidifier filter is designed to prevent growth and migration of mold， fungus， algae， and bacteria</li><li>Designed to fit Holmes humidifier models HM850， HM3300， HM3400， HM3500， HM3501， HM3600， HM3607， HM3608， HM3640， HM3641， HM3650， HM3655， HM7600， HF221， and HSL5000.</li><li>HWF72/HWF75 Holmes Replacement Humidifier Wick Filter. Aftermarket replacement filter manufactured by AFB</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51DKoyzwLKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51zLX%2BP7-4L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51Cp2qJLroL.jpg" noproxy>