Premium humidifier wick filter designed by Nispira. Compatible with Holmes, Sunbeam, and Bionaire Humidifiers requiring Filter "A". Compatible with Holmes HM1845 Humidifier; Holmes HM1855 Humidifier; Holmes HM1888 Humidifier; Holmes HM1975 Humidifier; Holmes HM2059 Humidifier; Holmes HM2060W Humidifier; Holmes HM2090 Humidifier; Holmes HM3000 Humidifier; Holmes HM3800 Humidifier; Holmes HM3850 Humidifier; Holmes HM4000 Humidifierp40, Evap1, Model 30, Model 50 evaporative humidifiers