Fantech® Bath Fan, 1-Phase, Series: PB Series, 139 cfm, 4 in Duct Dia, 120 VAC, 0.18 A, 60 Hz, 20.4 W, 6-1/2 in Housing Length, 4 in Housing Width, 1 in Housing Height, Galvanized Steel Housing, Humidity Sensing: No, Motion Sensing: No, Domestic