Patent ID: 8322683

Claim:
A damper actuator apparatus comprising: a substantially sealed housing unit comprising a lower housing member and an upper housing member; a drive motor configured within the sealed housing unit, the drive motor including a drive member configured to be rotatable about an axis of rotation of the drive motor, the drive member having a first end and a second end; a drive device coupled to the motor via the drive member, the drive device being configured to be driven in a first direction about the axial direction by the motor; a spring device coupled to the drive device, the spring device being configured to apply force to the drive device such that the drive device rotates in a return direction opposite to the first direction; and a fan device coupled to the drive device and disposed in the upper housing member of the housing unit, the fan device comprising a plurality of fan blades radially disposed about the axis of rotation, the fan blades disposed to produce an inflow of air in the radial direction and an outflow of air in the axial direction when the drive device rotates in the return direction opposite of the first direction, wherein the fan device is a paddle fan, wherein the fan blades extend from a cylindrical side plate to the outer portion of a base plate, and wherein the outer portions of fan blades are asymmetric relative to the radial direction, the upper housing member comprising a plurality of baffles radially disposed about the axis of rotation and axially aligned with the fan blades of the fan device.