Patent ID: 8851831

Claim:
An air dam module, comprising: a frame axially defining a vent through a front end and a rear end of the frame, the vent defining a substantially circular cross section; a first rotating member received in the vent, wherein a top side of the first rotating member is rotatably connected to a surface bounding the vent, the first rotating member comprises a substantially semicircular first shield plate vertically blocking a lower half of the vent upon a condition that its blocking position is not overcome by an airflow passing through the vent; a second rotating member received in the vent, wherein a top side of the second rotating member is rotatably connected to the surface bounding the vent, the second rotating member comprises a substantially quadrate second shield plate; and two sector-shaped third rotating members, each having an arched side, rotatably connected to opposite ends of the second shield plate with the arched sides being adjacent to the surface bounding the vent, wherein the second shield plate and the third shield plates vertically block an upper half of the vent upon a condition that their blocking positions are not overcome by an airflow passing through the vent.