| 摘要 |
A vent assembly for controlling flow of air into a room. The vent assembly comprises a housing and a damper member mounted entirely within the housing. The housing is mounted to a surface of the room such that air passing through an air duct pass through a passageway defined by the housing. Air flowing through the passageway causes the damper member to rotate into an open position; when no air is flowing through the passageway, gravity or another force (such as a return spring) causes the damper member to remain in a closed position. A control member may be provided to allow the damper member to placed into a locked closed configuration, a locked open configuration, or an open configuration.
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