protecting the equipment from backdrafts and improper combustion

Do I need to install external check valves with this drier

This 1K platinum RTD eliminates the drift common in thermistor-based sensors

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

or has separated from the hub

EWC Controls PRD Regulating Damper 30067439-890 protecting the equipment from backdraftsEWC 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.