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

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 .

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)

1 /8 in.

6 /2in.Max.

12 /4 in.Max.

Options (at additional cost)

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

• End Switch Kit: Model #851038

W & H dimensions furnished approximately /8 in. (3mm)

under size.

W is always parallel to damper blades.

WD-323 Rev. 3 April 2005