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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)
Pressure: 2.0 in. wg (498 Pa) - differential
pressure
Velocity: 2500 fpm (13 m/s)
Temperature: 180°F (82ºC)
Standard Construction
Frame: 18 ga. (1.3mm) galvanized steel
Blades: 0.025 in. (0.64mm) aluminum
Axles:
/
in. (4.8mm) dia. zinc plated steel
3
16
rod, full length
Bearings: Synthetic (acetal)
Linkage: 0.064 in. (1.6mm) 6061T6 aluminum
tie bar
Blade Seals: Vinyl
Size Limitations
(see pages 3 & 4 for specific
limitations)
Minimum Panel Size
Maximum Panel Size
Single Panel: 31 in. W x 74 in. H
Double Panel (WD-400/410): 50 in. W x 74 in. H
Double Panel (WD-420/430): 63 in. W x 74 in. H
Triple Panel (WD-420/430): 74 in. W x 74 in. H
Options and Accessories
• 1
/
in. (38mm) flange on discharge: WD-420
1
2
• 1
1
/
in. (38mm) flange on intake:
2
• Stainless Steel Axles
8 in. W x 8 in. H
(203mm x 203mm)
(787mm x 1880mm)
(1270mm x 1880mm)
(1600mm x 1880mm)
(1880mm x 1880mm)
(at additional cost)
WD-430
WD-400 SERIES
Non-Motorized Backdraft Damper
Horizontal or Vertical Mount (Intake)
W*
H*
Triple Panel
Model WD-410
*H
Airflow
Model WD-400
No Flange
Flange on Discharge
W*
H*
Double Panel
*W & H dimensions furnished
approximately
/
in. (3mm) under size.
1
8
*H
No Flange
*H
*H
Airflow
Airflow
Model WD-420
Model WD-430
Flange on Intake
W*
H*
Single Panel
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Related Manuals for Greenheck WD-400 Series
Summary of Contents for Greenheck WD-400 Series
- Page 1 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.
-
Page 2: Performance Data
0.04 0.03 Full Open 0.02 5 6 7 8 9 10 5 6 7 8 9 10 x 100 x 1000 of damper face WD-400 SERIES WD-410 ∆P Operational Data in. wg (Pa) Blades Start to Open 0.014 (3.5) Blades Fully Open 0.12... - Page 3 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. •...
-
Page 4: Specifications
Basis of design is Greenheck model WD-400. SPECIFICATIONS Above 74 128 Up Up To 128 To 148 Double Double Panel Panel Three Section Section Double Double Panel Panel Four Section Section Copyright © 2005 Greenheck Fan Corporation WD-400 Rev. 5 November 2005...