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.
  - 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.
  - 6 inch / 152mm diameter.