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Application and Design

The WD-323 series is a vertically mounted backdraft damper that is 
designed for use with Models CW & CWB centrifugal sidewall exhaust fans 
to allow horizontal airflow and prevent reverse airflow. The damper is opened 
by air pressure differential and gravity and closed by springs. Optional motor 
pack converts to motorized operation.

Standard Construction

 

Frame:

  0.063 in. (1.6mm) extruded aluminum.

 

Blades:

  0.025 in. (.64mm) roll formed aluminum.

 

Axles:

 

3

/

16

 in. (4.8mm) diameter plated steel, full length.

 

Bearings:

  Synthetic sleeve type.

 

Linkage:

  0.064 in. (1.6mm) aluminum tie bar.

 

  Spring assisted to close blades.

 

Blade Seals:

  Vinyl .

 Sizes Available:

  8 in. x 8 in.     (203mm x 203mm)

 

  10 in. x 10 in. (254mm x 254mm)

 

  12 in. x 12 in. (305mm x 305mm)

 

  15 in. x 15 in. (381mm x 381mm)

 

  17 in. x 17 in. (432mm x 432mm)

 

  20 in. x 20 in. (508mm x 508mm)

 

  25 in. x 25 in. (635mm x 635mm) 

Options 

(at additional cost)

 

•  WD-323 Motor Packs (24v, 115v, 208/230v, or 440v)

 

•  End Switch Kit:   Model #851038

®

Airflow

*Damper

Size

6 1/2in.Max.

1 7/8 in.

12 1/4 in.Max.

1 5/16 in.

1 5/16 in.

WD-323

For Use With Models CW & CWB 

Centrifugal Sidewall Exhaust Fans

Special Purpose

BACKDRAFT DAMPER

*  W & H dimensions furnished approximately 

1

/

8

 in. (3mm) 

under size.

  W is always parallel to damper blades.

Copyright ©2005 Greenheck Fan Corporation

WD-323 Rev. 3 April 2005

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