| 摘要 |
An air flow control valve for directing air flow within a house or building. The control valve can selectively direct air flow between two alternative air flow paths. The control valve is of generally cylindrical configuration having an open wall portion or an open wall portion and an open base. The cylinder valve is pivotally mounted within a chamber providing air flow communication through ductwork with at least one thermal source area and at least one area of thermal need.
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