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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