Modified parallel blade damper for an air handling system
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United States of America Patent
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Dec 19, 1989
Grant Date -
N/A
app pub date -
Dec 12, 1988
filing date -
Dec 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiple blade damper for an air handling system of the type in which at least an adjacent pair of blades of the damper are operated in parallel, that is, in which each of such pair of blades is oscillated in the same direction as the other of the pair of blades which is adjacent to it. A generally L-shaped baffle is positioned in the duct in which the damper is located between the adjacent pair of damper blades in alignment with the overlapping edges of the damper blades in their closed positions, with a short leg of the baffle extending normally of the air flow path through the damper and a long leg extending along the air flow path, a major terminal portion of the long leg extending at a small acute angle, for example at 15.degree., with respect to the air flow path. The fixed baffle increases the pressure drop across the damper to more closely correspond to that of a multiple blade damper of the opposed blade type, and can be used to retrofit existing dampers when it is desirable to change the pressure drop characteristic thereof.
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