Extruded BACKDRAFT DAMPER
ES-40 SERIES
Horizontal Mount Vertical Airflow Down
Application and Design
The ES-40 series is a horizontally mounted backdraft damper
that is 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.
Ratings (See page 2 for specific limitations)
Pressure: 2.5 in. wg (622 Pa) - differential pressure
Velocity: 2000 fpm (10.2 m/s)
Temperature: 180°F (82ºC)
W*
H*
Standard Construction
Frame: 6063T5 extruded aluminum
(0.063 in. [1.6mm] thickness)
Blades: 6063T5 extruded aluminum.
(0.050 in. [1.3mm] thickness)
*W & H dimensions furnished approximately 1/4 in. (6mm) under size.
Axle Bearings: Synthetic polycarbonate sleeve type
Linkage: 1/8 in. (3mm) aluminum
Blade Seals: Vinyl
2" Max.
Size Limitations
2"
Minimum Size:
6 in. W x 8 in. H
(152mm x 203mm)
3"
Maximum Size: 40 in. W x 52 in. H
(1016mm x 1321mm)
ES-40
No Flange
Options and Accessories
• 11/2 in. (38mm) flange on discharge: ES-41
• 11/2 in. (38mm) flange on intake:
• Pull Chain Actuator
ES-42
1 1/2"
1 1/2"
• Wing Nut Actuator
ES-41
FlanEgeSO-n4I2ntake
Flange On Discharge
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