Our 120SW baseboard supply air diffuser is used to control air flow from your heating and air conditioning system from baseboard vents. An easy pull on the latch closes the damper quietly and smoothly. It is constructed of high-quality steel with a white powder coating and ensures maximum air flow and circulation.. Steel construction with white powder coat finish. Easy opening and closing of the vent from the damper latch. Ensures maximum air flow and circulation. Allows air to flow freely between your ventilation system and a room. High quality steel components. White powder coat finish. Single Blade SmoothGlide Damper. #8 x 2: Long Mounting Screws included. Air deflection: 3-way. Color: Powder Coat White. Color Family: Whites. Features: Louvered. Installation Location: Baseboard. Material: Steel. Maximum Duct Opening Length (in.): 4 in. Maximum Duct Opening Width (in.): 21 in. Pack Size: 1. Product Weight (lb.): 3.15 lb. Shape: Triangle. Outside Length (in.): 4.5 in. Outside Width (in.): 24 in