Extraction fan assembly including a damper that closes firmly when the fan is not running and reduces the pressure drop when the fan is running at full speed
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United States of America Patent
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-
Mar 18, 2014
Grant Date -
Jun 14, 2012
app pub date -
Apr 12, 2011
filing date -
Dec 13, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An extraction fan has a housing mounted in a wall with an outlet duct extending through the wall to an outlet opening outside the wall. A damper flap is mounted on the fan suspended by a hinge at an upper edge so as to extend in a closed position across the opening and is movable to an open position under forward air flow from the fan, and tightly closes against a resilient deformable seal when the fan is shut off. A spring biasing cam applies inwards force to the damper flap to bias the damper flap into the closed position, and an outwards force also to bias the damper flap into the fully open position. The mounting plate includes a hood having a top wall extending over the top of the damper flap and a down-turned front flange extending parallel to the damper flap to a bottom edge.
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