Gvd4.mp4

The damper remains closed during "off cycles" to trap conditioned air inside. When the thermostat calls for heat, a motor rotates the damper 90 degrees to an open position in approximately 15 seconds, allowing flue gases to vent safely.

, a series of automatic gas vent dampers used in residential and commercial HVAC systems. These devices are designed to improve energy efficiency by preventing heat from escaping through the chimney when a gas boiler is in standby mode. Technical Overview: The GVD-4 Series The Field Controls GVD-4PL GVD4.mp4

It includes dual internal safety switches that prevent the burner from firing unless the damper is confirmed to be in the fully open position. The damper remains closed during "off cycles" to