Duracraft AC-818 Humidifier Wick Filter 3 Pack (Aftermarket) Fits Duracraft Natural Cool Moisture Humidifier models DH831, DH4C, DH8000, DH8002, DH8003, DH8004, DH8005, DH813, DH4C and DH83. 3 filters per box. Measures approximately 7.75" x 9.5" x 1.75". Duracraft humidifier wick replacement filters. This is an aftermarket filter.