Duracraft AC-813 Humidifier Wick Filter 2 Pack (Aftermarket) (UFD13C=UDC) Fits Duracraft Natural Cool Moisture Humidifier models DH830, DH832, HC832. 2 filters per box. Measures approximately 3 3/4" x 5 1/2" x 1 1/2". Duracraft humidifier wick replacement filters. This is an aftermarket filter.