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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

/

2

"

2"

1

/

2

"

3"

2" Max.

2"

3"

2" Max.

2"

2"

1

/

2

"

2"

1

/

2

"

3"

2" Max.

2"

3"

2" Max.

2"

2"

1

/

2

"

2"

1

/

2

"

3"

2" Max.

2"

3"

2" Max.

2"

2"

1

/

2

"

2"

1

/

2

"

3"

2" Max.

2"

3"

2" Max.

2"

Note: Counterbalance weights may require field adjustment. Instructions are available at www.greenheck.com.

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