Butterfly Dampers

Dampers are used to throttle the air entering or leaving a fan and to control air flow in branches of a system or at points of delivery. Dampers control airflow by changing the amount of restriction in an air stream. Increasing the restriction creates a larger pressure drop across the damper and dissipates some flow energy while decreasing the restriction and reduces the pressure differential and allows more airflow. This is the most cost effective and simple type of damper normally fitted at fan inlet for manual control. This damper is suitable for situations where accurate volume flow is not required.