The Young Regulator Model 4075 is a round, motorized Modulating damper. It regulates air flow by adjusting the position of the damper blade. It is equipped with a direct-coupled, 7-minute actuator. The slow movement of the blade allows for quiet operation and more even temperatures.
When paired with a single-pole, double-throw center-OFF thermostat the 4075 modulating temperature control.
The 4075 pairs with the T-312.