BACK DRAFT DAMPER
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United States of America Patent
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app pub date -
May 6, 2010
filing date -
Jul 29, 2009
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Abstract
A damper is provided. The damper includes a frame having a central opening through which air passes. A plurality of vanes are rotatably mounted within the frame. At least one of the vanes is oriented about a rotational axis that is offset at a non-orthogonal angle with respect to one of a horizontal and vertical axis.
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