The Compatible HAC-504 Humidifier Wick Filter Replacement fits several models of Honeywell, KAZ, Vicks, and Robitussin humidifiers. This humidifier wick filter has dimensions of approximately  3-3/4"x 5-3/4"x 9-1/4"

• HCM-300 Series: HCM-300T, HCM-315T, HCM-350

• HCM-500 Series:HCM-530, HCM-535, HCM-540, HCM-550, HCM-560, HCM-551

• HCM-600 Series: HCM-630, HCM-631, HCM-635, HCM-645, HCM-650

• HCM-710

• HCM-1000 Series: HCM-1000C, HCM-1010.

• HCM-2000 Series: HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050

• Enviracaire Model: ECM-250i