opposed-blade damper

opposed-blade damper

A damper, 1 through which the airflow is adjusted by means of two sections of damper blades on a common linkage, arranged so that adjacent blades rotate in opposite directions. (See illustration p. 682.)
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Since damper authority affects the installed characteristic curve of an ideal duct-damper path, which has a controlled differential static pressure between its two connected nodes, in order to obtain an approximate linear installed characteristic curve, a parallel-blade damper is preferred for the paths with high damper authority and an opposed-blade damper is preferred for the paths with low damper authority (ASHRAE 2010c; Lizardos and Elovitz 2000).
Empirical Parameter for Primary Airflow Model with Opposed-Blade Damper Damper OB8 ([R.