Motorized Volume Control Damper, Single Panel, Power Open, Spring Return, Voltage 100 to 240, 50/60 Hz, 1 Phase, Sq. Opening Required (In.) 36, Free Area (Square-Ft.) 7.559, Max. Velocity (FPM) 3500, Extruded Aluminum Frame and Blades, Mounting Position Horizontal or Vertical, For Use With Duct Work In Volume Control Intake or Exhaust Applications Motorized Volume-Control Channel-Style DampersRegulate airflow in medium- and low-pressure commercial applications. TPV louver seals and stainless steel jambs minimize leakage. Actuator is internally installed. Mill-finish extruded aluminum frame (5" deep x 0.1" thick) and louvers (0.08" thick). Plated steel linkage and pivot pins.100 to 240V Exhaust or supply Mount: horizontal or vertical Max. velocity: 3500 fpm