Overview The EARD is a round damper with a 24 Vac powered-open/spring-closed motor. It is used for fresh air intake for ventilation or for combustion makeup air. Features Adjustable damper position range stops. Single-blade damper. Shipped as power open/spring return closed damper. Galvanized steel. Quiet operation. Can be field-converted to power closed/spring return open damper. Blade closes off tightly against gasket for minimal leakage. Male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct. Product Specifications ApplicationFresh Air Damper Voltage24V Size (in.)6 1n. diamete Size (mm)152 mm diameter Damper TypeSingle-blade, round ShapeRound Motor or Actuator MountingSide or Top MotorPower open, spring closed, reversible Motor Timing30 seconds power closed/10 seconds spring return Wires to Motor2 Other Motor InformationRange stops