The ES-40 series are horizontally mounted backdraft dampers designed to allow vertical airflow down and prevent reverse airflow up. Model ES-40 has no flange, model ES-41 has a flange on the discharge side, and model ES-42 has a flange on the intake side. All dampers in this series open by air pressure differential and close by gravity. This series includes adjustable counterbalance weights to assist closing.
Pressure: Up to 2½ in. wg
Velocity: Up to 2000 fpm
Extruded Aluminum Frame
Damper Selection Guide
Which damper best fits the application? Greenheck’s damper interactive selection guide removes the guesswork. Find blade type, velocity, pressure, AMCA listings, submittals, drawings and more, all in one easy-to-use format.