20" stainless steel rear ducted rv range hood (12 volt dc) hengs stainless steel finish with slope nose design 12 volt power only - 110/115/220 volt such as in a house or generator will damage the unit rear exterior duct style duct hole rough overall measurements 3 1/4 " x 9 1/2" centered in back of range hood front control panel with separate rocker switches to control 12 volt fan and 10 watt light overall dimensions 20" wide x 18" deep x 5 1/4" tall slope nose allows installation of this unit with cabinets from 12"-18" deep remove and clean filter often - to prevent fire clean grease laden areas often - exercise care when using cleaning agents or detergents to not scratch finish of unit