What is the correct pressure setting for this switch

Engineered as the direct replacement for the legacy 4004/53 series

maintaining a secure connection between the actuator drive and the damper shaft

Utilizing OEM parts like the 1086407 significantly reduces balancing issues compared to generic alternatives

EWC Controls PRD Regulating Damper 30067439-890 What is the correct pressureEWC Controls PRD 12" Pressure Regulating Damper Made in USA. Model PRD RD pressure regulating damper is a single 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.