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Performance Data
Performance data results from testing a 36 in. x 36 in.
(914mm x 914mm) damper in accordance with AMCA Standard
500-D using Figure 5.3 and Figure 5.5. All data has been
corrected to represent standard air at 0.075 lb/ft
(1.201 kg/m
).
3
Operational Data
Without Weight
Figure 5.3
With Weights
Without Weights
Figure 5.5
With Weights
Leakage testing was conducted in accordance with AMCA
Standard 500D and is expressed as CFM per sq. ft. of damper
face area. All data has been corrected to represent standard air
3
at 0.075 lb/ft
(1.201 kg/m
36 in. x 36 in. Damper
8.5
8
7
6
5
4
3
2
1.0
.9
.8
.7
.6
.5
.4
.3
.2
1
2
3
4
5
10
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: heavy gauge 6063T5
extruded aluminum channel frame (0.125 in. [3.2mm] thick) with
3 1 Ú8 in. (79mm) depth; blades from 0.070 in. (1.8mm) 6063T5
extruded aluminum; 3 /4 in. (19mm) dia. metallic axles turning in
acetal bearings; damper shall be equipped with extruded vinyl
blade seals; and internal 1 /8 in. (3mm) plated steel blade-to-
blade linkage. 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 10 in. wg (2491 Pa), velocities to 3500 fpm
(18m/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 EM-30.
3
ÆP in. wg
(Pa)
Blades Start to Open
0.03 (7.5)
Blades Fully Open
0.25 (62)
Blades Start to Open
0.01 (2.5)
Blades Fully Open
0.055 (13.7)
Blades Start to Open
0.025 (6.2)
Blades Fully Open
0.32 (8)
Blades Start to Open
0.012 (3)
Blades Fully Open
0.08 (20)
).
3
Leakage
130
6 7 8 9
20
30
40 50 60 70 80 90 100
Air Leakage in CFM/Sq. Ft.
10
9
8
7
6
5
4
* With Counterbalance
Velocity
3
fpm (m/s)
2
10 (.05)
1.0
.9
.8
2500 (12.7)
.7
.6
.5
10 (.05)
.4
1200 (6.1)
.3
.2
10 (.05)
1200 (6.1)
.10
.09
.08
10 (.05)
.07
.06
.05
700 (3.6)
.04
.03
.02
1
6
5
4
3
2
1.0
.9
.8
.7
.6
.5
.4
.3
.2
1
2
150
Pressure Drop
Weights
2
3
4
5 6 7 8 9 10
2
3
4
5
6 7 8 9 10
x 10
x 100
Velocity (fpm)
140
Pressure Limitations
10.0 in. w.g.
10
8.0 in. w.g.
8
6.0 in. w.g.
6
4.0 in. w.g.
4
2
0
0
12
24
36
Damper Width (in.)
Velocity Limitations
3
4
5
6
7
8 9 1 0
74
Air Leakage in CFM/Sq. Ft.
2500 fpm
60
3000 fpm
36
3500 fpm
0
0
12
24
36
Damper Width (in.)
Copyright © 2008 Greenheck Fan Corporation
EM-30
2
3
4
5
6 7 8 9 10
x 1000
48
20
30
40
50 60
48
EM-30 Rev 4 Aug 2008
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