Robitussin ACR-832 Humidifier Filter 2 Pack (Aftermarket) Fits Robitussin Cool Moisture Humidifier models DH-830 and DH-832. 2 filters per box. Measures approximately 3 3/4" x 5 1/2" x 1 1/2". Robitussin humidifier wick replacement filters. This is an aftermarket filter.