Greenheck Fan Ventilation Hood WD 323 User Manual

WD-323  
For Use With Models CW & CWB  
Centrifugal Sidewall Exhaust Fans  
®
Special Purpose  
BACKDRAFT DAMPER  
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  
5
1 /16 in.  
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.  
*Damper  
Size  
Airflow  
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 .  
5
1 /16 in.  
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)  
7
1 /8 in.  
1
6 /2in.Max.  
1
12 /4 in.Max.  
Options (at additional cost)  
• WD-323 Motor Packs (24v, 115v, 208/230v, or 440v)  
• End Switch Kit: Model #851038  
1
*
W & H dimensions furnished approximately /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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