Holmes "A" Humidifier Filter, HWF62 Fits Holmes, Sunbeam, and Bionaire Humidifiers requiring Filter "A" Traps mineral deposits found in water, Designed to inhibit the growth of bacteria, mold and mildew Enhanced with Arm & Hammer baking soda and antimicrobial treatment Type A filter for use with HM1281, HM1701, HM1761, HM1297 and HM2409