| 摘要 |
A duct air cover is disclosed which allows for the easy escape of air when it is being forced under pressure but cuts off drafts of air not under pressure. Two lightweight air deflector flaps are hinged at opposing sides of an air duct. When temperature controlled air is forced through the duct in question, the lightweight flaps are easily lifted from the register by the air pressure itself thereby allowing for the flow of temperature controlled air. However, when the air is no longer forced, the flaps return to a closed position thus preventing cold drafts of air from flowing out through the ducts.
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