Greenheck Fan ES-40 Series
The ES-40 series is a horizontally mounted backdraft damper designed to allow vertical airflow down and prevent reverse airflow. The damper is opened by air pressure differential and closed by gravity. Standard models include adjustable counterbalance weights to assist closing. The frame is made of 6063T5 extruded aluminum (0.063 in. [1.6mm] thickness), and the blades are made of 6063T5 extruded aluminum (0.050 in. [1.3mm] thickness). The axle bearings are synthetic polycarbonate sleeve type, and the linkage is 1/8 in. (3mm) aluminum. The blade seals are vinyl.
Greenheck Fan ES-40 Series
The ES-40 series is a horizontally mounted backdraft damper designed to allow vertical airflow down and prevent reverse airflow. The damper is opened by air pressure differential and closed by gravity. Standard models include adjustable counterbalance weights to assist closing. The frame is made of 6063T5 extruded aluminum (0.063 in. [1.6mm] thickness), and the blades are made of 6063T5 extruded aluminum (0.050 in. [1.3mm] thickness). The axle bearings are synthetic polycarbonate sleeve type, and the linkage is 1/8 in. (3mm) aluminum. The blade seals are vinyl.
Greenheck Fan ES-40 Series
The ES-40 series is a horizontally mounted backdraft damper designed to allow vertical airflow down and prevent reverse airflow. The damper is opened by air pressure differential and closed by gravity. Standard models include adjustable counterbalance weights to assist closing. The frame is made of 6063T5 extruded aluminum (0.063 in. [1.6mm] thickness), and the blades are made of 6063T5 extruded aluminum (0.050 in. [1.3mm] thickness). The axle bearings are synthetic polycarbonate sleeve type, and the linkage is 1/8 in. (3mm) aluminum. The blade seals are vinyl.
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