The Model PRD-RD pressure regulating damper is a 1-blade, round variation of a barometric relief damper. This is the simplest, most economical way of bypassing excess static pressure in multi-zone applications. Resistance is controlled by offsetting the arm and adjusting the weights. The arm can be inserted into either side of the damper for added versatility.

EWC® Ultra-Zone Pressure Relief Damper, PRD-RD Model, 8 in Size, 400 cu-ft/min, Single Blade, 24 ga Steel, Galvanized, Round, 185 deg F

• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/EWC_PRD_12X8_Specification_Sheet.pdf