Motorized Damper, For Fan Dia. 12 In., Voltage 100 to 240, 50/60 Hz, Overall Square 15 In., Sq. Opening Required 13 In., Frame Less Flange 12 sq. in., Free Area 0.835 sq. ft., Motor Bracket Extension 6-7/8 In., Frame Thickness is 0.125 In., Blade Thickness is 0.080 In., Flange Width 1-1/2 In., Extruded Aluminum, Mounting Position Horizontal or Vertical, Number of Panels 1, Power Open, Spring Return, For Use With Intake or Exhaust Applications