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148
8
8
148
74
7432 64
128
Double
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One
Section
Single
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Double
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o
Section
Double
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Width
Height
128 Up
To 148
64 Up
Thru 74
8 Up
To 32
32 Up
To 64
Above 74
Up To 128
8 Up
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Above 74
Thru 148
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(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
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.
WD-420/430 SELECTION SPECIFICATIONS
Copyright © 2005 Greenheck Fan Corporation
WD-400 Rev. 5 November 2005
*Width and height given in inches.