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)
Standard Construction
Frame:
6063T5 extruded aluminum
(0.063 in. [1.6mm] thickness)
Blades:
6063T5 extruded aluminum.
(0.050 in. [1.3mm] thickness)
Axle Bearings:
Synthetic polycarbonate sleeve type
Linkage:
1
/
8
in. (3mm) aluminum
Blade Seals:
Vinyl
Size Limitations
Minimum Size:
6 in. W x 8 in. H
(152mm x 203mm)
Maximum Size:
40 in. W x 52 in. H
(1016mm x 1321mm)
Options and Accessories
• 1
1
/
2
in. (38mm) flange on discharge: ES-41
• 1
1
/
2
in. (38mm) flange on intake:
ES-42
• Pull Chain Actuator
• Wing Nut Actuator
ES-40 SERIES
Horizontal Mount Vertical Airflow Down
*W & H dimensions furnished approximately
1
/
4
in. (6mm) under size.
Extruded
BACKDRAFT DAMPER
W*
H*
ES-40
No Flange
ES-41
Flange On Discharge
ES-42
Flange On Intake
2"
1
1
/
2
"
2"
1
1
/
2
"
3"
2" Max.
2"
3"
2" Max.
2"
2"
1
1
/
2
"
2"
1
1
/
2
"
3"
2" Max.
2"
3"
2" Max.
2"
2"
1
1
/
2
"
2"
1
1
/
2
"
3"
2" Max.
2"
3"
2" Max.
2"
2"
1
1
/
2
"
2"
1
1
/
2
"
3"
2" Max.
2"
3"
2" Max.
2"
Note: Counterbalance weights may require field adjustment. Instructions are available at www.greenheck.com.
