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
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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
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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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