| 摘要 |
A multiple entry air intake passage for a heating and air conditioning system has a first inlet for receiving fresh air and a second inlet for receiving recirculation air, the second inlet having two distinct openings in two walls of the passage housing for increasing the flow of air into the system. An L-shaped damper door has a main portion disposed to seal a main opening of the second inlet, and an auxiliary portion disposed to seal an auxiliary opening of the second inlet. The L-shaped damper door is pivotally mounted onto the housing of the air intake passage to allow pivoting movement between the fresh air and recirculation air positions. The damper door is also slidable along the axis of the pivotal hinge, such that when a bearing surface on the damper door engages a camming ramp at the beginning of pivoting movement away from the fresh air position, the auxiliary portion of the damper door is lifted away from the auxiliary opening, thus reducing wear of the seal disposed upon peripheral portions of the damper door. The passage also includes a hinge lever mounted to the damper door, the hinge lever being suitable for connection to control means which controls movement of the damper door between fresh air and recirculation air positions.
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