Greenheck Fan Ventilation Hood WD 400 Series User Manual

WD-400 SERIES  
Non-Motorized Backdraft Damper  
Horizontal or Vertical Mount (Intake)  
Application and Design  
The WD-400 series are non-motorized backdraft dampers which may be mounted either vertically for intake air or mounted  
horizontally to allow vertical airflow down and prevent reverse airflow. The dampers are opened by air pressure differential and  
closed by springs. Optional motor packs are not available.  
Ratings (See page 2 for specific limitations)  
W*  
Pressure: 2.0 in. wg (498 Pa) - differential  
pressure  
Velocity: 2500 fpm (13 m/s)  
W*  
Temperature: 180°F (82ºC)  
H*  
W*  
Standard Construction  
Frame: 18 ga. (1.3mm) galvanized steel  
Blades: 0.025 in. (0.64mm) aluminum  
Axles: 3/16 in. (4.8mm) dia. zinc plated steel  
H*  
Single Panel  
rod, full length  
H*  
Bearings: Synthetic (acetal)  
Double Panel  
Linkage: 0.064 in. (1.6mm) 6061T6 aluminum  
tie bar  
Blade Seals: Vinyl  
Triple Panel  
*W & H dimensions furnished  
approximately 1/8 in. (3mm) under size.  
Size Limitations (see pages 3 & 4 for specific  
limitations)  
Minimum Panel Size  
8 in. W x 8 in. H  
*H  
(203mm x 203mm)  
3 3  
/
8
in.  
in.  
Maximum Panel Size  
Single Panel: 31 in. W x 74 in. H  
(787mm x 1880mm)  
3 3  
/
4
Max.  
Double Panel (WD-400/410): 50 in. W x 74 in. H  
(1270mm x 1880mm)  
Model WD-410  
No Flange  
Double Panel (WD-420/430): 63 in. W x 74 in. H  
(1600mm x 1880mm)  
1 1  
/
2
in.  
1 1  
in.  
/
2
Triple Panel (WD-420/430): 74 in. W x 74 in. H  
(1880mm x 1880mm)  
*H  
*H  
*H  
Options and Accessories (at additional cost)  
• 11/2 in. (38mm) flange on discharge: WD-420  
• 11/2 in. (38mm) flange on intake:  
• Stainless Steel Axles  
WD-430  
Airflow  
Airflow  
Airflow  
1 1  
/
2
in.  
in.  
11  
/
2
in.  
in.  
3 3  
/8 in.  
/
4 5  
Max.  
8
in.  
3 1  
/
2
3 1  
4 5  
Max.  
/
8
in.  
4 5  
Max.  
/8 in.  
/
2
Model WD-400  
Model WD-420  
Model WD-430  
No Flange  
Flange on Discharge  
Flange on Intake  
 
WD-400/410 SELECTION  
Multiple section dampers shown below are supplied as equal size sections. Any damper that has multiple sections, both  
vertically and horizontally, will require field assembly and will require additional reinforcement (not supplied by Greenheck)  
to support the assembly. These larger dampers must have the additional reinforcement to give them structural stability.  
Please note that the width dimension is always taken as being parallel to the length of the blades.  
Width  
100  
128  
150  
8
32  
50  
64  
8 Up  
To 32  
Above 50  
128 Up  
To 150  
32 Up  
Thru 50  
64 Up  
Thru 100  
Above 100  
Up To 128  
Up To 64  
8
Double  
Panel  
Single  
Panel  
One  
Double  
Panel  
Single  
Panel  
Two  
Single  
Panel  
Four  
Double  
Panel  
Three  
One  
Two  
Section  
Section  
Section  
Section  
Section  
Section  
74  
Double  
Panel  
Six  
Single  
Panel  
Single  
Panel  
Four  
Double  
Panel  
Double  
Panel  
Single  
Panel  
Two  
Eight  
Four  
Two  
Section  
Section  
Section  
Section  
Section  
Section  
148  
Note: A 26 in. x 26 in. and a 30 in. x 30 in. WD-410 will be supplied as a Double Panel, One Section damper.  
*Width and height given in inches.  
3
 
WD-420/430 SELECTION  
SPECIFICATIONS  
Multiple section dampers shown below are supplied as equal size sections. Any damper that has multiple sections, both  
vertically and horizontally, will require field assembly and will require additional reinforcement (not supplied by Greenheck)  
to support the assembly. These larger dampers must have the additional reinforcement to give them structural stability.  
Please note that the width dimension is always taken as being parallel to the length of the blades.  
Width  
128  
148  
8
32  
64  
74  
8 Up  
To 32  
Above 74  
Up To 128  
128 Up  
To 148  
32 Up  
To 64  
64 Up  
Thru 74  
8
Double  
Panel  
Single  
Panel  
One  
Double  
Panel  
Triple  
Panel  
One  
Double  
Panel  
Three  
One  
Two  
Section  
Section  
Section  
Section  
Section  
74  
Double  
Panel  
Triple  
Panel  
Two  
Double  
Panel  
Double  
Panel  
Six  
Single  
Panel  
Two  
Two  
Four  
Section  
Section  
Section  
Section  
Section  
148  
*Width and height given in inches.  
Specifications  
(on-blade) with spring closure. Damper manufacturer's  
printed application and performance data including  
pressure, velocity and temperature limitations shall be  
submitted for approval showing damper suitable for  
pressures to 2.0 in. wg (498 Pa), velocities to 2500 fpm  
(13m/s) and temperatures to 180°F (82ºC). Testing and  
ratings to be in accordance with AMCA Standard 500-D.  
Basis of design is Greenheck model WD-400.  
Backdraft dampers meeting the following specifications shall  
be furnished and installed where shown on plans and/or as  
described in schedules. Dampers shall consist of: 18 ga.  
(1.3mm) galvanized steel frame with 3 1/2 in. (89mm) depth;  
blades from 0.025 in. (.64mm) roll-formed aluminum; 3/16 in.  
(4.8mm) dia. plated steel, full length axles turning in acetal  
bearings; damper shall be equipped with extruded vinyl  
blade seals; and internal 0.064 in. (1.6mm) aluminum tie bar  
Copyright © 2005 Greenheck Fan Corporation  
WD-400 Rev. 5 November 2005  
 

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