parallel-blade damper

parallel-blade damper

A damper, 1 through which the airflow is adjusted by means of damper blades on a common linkage, arranged so that adjacent blades rotate parallel to each other, providing little control of airflow; used primarily as an on-off control.
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The damper resistance factor depends on the damper type (opposed-blade or parallel-blade damper) and can be expressed as a function of the damper blade position [theta], for a given damper.

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