What is the difference between a Backdraft Damper and a Pressure Relief Damper?
Backdraft dampers are designed to allow airflow in one direction and prevent reverse airflow. Pressure Relief dampers have an adjustable open trigger pressure and close upon a decrease in the differential pressure across the damper. Pressure relief dampers also prevent backdraft air flow.
Does United Enertech have counterweight kits for your backdraft/pressure relief damper?
Counterweight are primary factory installed but can be installed in the field with some difficulty.