The Compatible Holmes HWF72 Wick Humidifier Filter Replacement is an evaporator pad compatible with Holmes humidifier models HM3600, HM3640, HM3650, and HM3655.
This humidifier filter replacement measures approximately7 3/4" x 7 1/2" x 9 1/2"x 1" and helps to reduce mineral pollutants in the humidifier water.