Specifications
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:
6063T5 extruded aluminum channel frame (0.063 in. [1.6mm]
thick) with 2 in. (51mm) depth; blades from 0.050 in. (1.3mm)
6063T5 extruded aluminum; synthetic polycarbonate axle
bearings; damper shall be equipped with extruded vinyl blade
seals; and internal
1
/
8
in. (3mm) aluminum linkage. Damper
1.0
.9
.8
.7
.6
.5
.4
.3
.2
15
10
9
8
7
6
5
4
3
2
Air Leakage in CFM/Sq. Ft.
1
2 3 4
5 6 7
8 9 10
20 30 40
50 60
70
80
90
100 150
ES
Static Pressure Difference (in. wg)
Leakage testing was conducted in accordance with AMCA
Standard 500-D and is expressed as CFM per sq. ft. of
damper face area. All data has been corrected to represent
standard air at 0.075 lb/ft
3
(1.201 kg/m
3
).
Leakage
36” x 36” Damper
ÆP in. wg Velocity
Operational Data
(Pa) fpm (m/s)
Without Weights
Blades Start to Open 0.05 (12) 35 (.18)
Blades Fully Open 0.27 (67)
1000 (5.1)
With Weights
Blades Start to Open 0.015 (3.7)
15 (.08)
Blades Fully Open 0.13 (32)
600 (3.1)
Velocity (fpm)
1
x 10
Pr
essur
e Loss (
In. w
.g.)
10
9
8
7
6
5
4
3
2
2 3 4 5 6 7 8 9 10
1.0
.9
.8
.7
.6
.5
.4
.3
.2
.10
.09
.08
.07
.06
.05
.04
.03
.02
x 100
2 3 4 5 6 7 8 9 10
x 1000
2 3 4 5 6 7 8 9 10
With
We
igh
ts
Wit
hout
Wei
ghts
Pressure Drop
36” x 36” 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 2.5 in. wg (623 Pa), velocities to 2000 fpm
(10.2m/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 ES-30.
Performance data results from testing a 36” x 36” damper
in accordance with AMCA Standard 500-D using Figure
5.5 (no duct either side). All data has been corrected to
represent standard air at 0.075 lb/ft
3
(1.201 kg/m
3
).
Leakage
Pressure Drop
Copyright © 2008 Greenheck Fan Corporation
ES-30 Rev. 3 Aug 2008
Performance Data ES-30
