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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 5.7A (unducted). All data has been corrected
to represent standard air at 0.075 lb/ft
Operational Data
Damper with Standard
Blades Start to Open
Bearings
Blades Fully Open
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
3
at 0.075 lb/ft
(1.201 kg/m
36 in. x 36 in. Damper
6
5
4
3
2
1.0
.9
.8
.7
.6
.5
.4
.3
.2
1
2
3
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
Ú
in. (79mm) depth; blades from 0.070 in.(1.8mm)
1
8
6063T5 extruded aluminum;
turning in acetal bearings; damper shall be equipped with
extruded vinyl blade seals; and internal
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 (18 m/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-40.
3
(1.201 kg/m
ÆP in. wg
(Pa)
0.07 (17)
0.20 (50)
).
3
Leakage
140
4
5
6
7
8 9 1 0
20
30
Air Leakage in CFM/Sq. Ft.
3
/
in. (19mm) dia. metallic axles
4
/
in. (3mm) plated
1
8
10
9
8
7
6
5
).
3
4
3
2
Veloc-
ity fpm
1.0
(m/s)
.9
.8
.7
.6
50 (.254)
.5
.4
1200 (6.2)
.3
.2
.10
.09
.08
.07
.06
.05
.04
.03
.02
1
40
50 60
Pressure Drop
2
3
4
5 6 7 8 9 10
2
3
4
5 6 7 8 9 10
x 10
x 100
Velocity (fpm)
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
Damper Width (in.)
Velocity Limitations
74
60
3000 fpm
36
3500 fpm
0
0
12
24
Damper Width (in.)
Copyright © 2008 Greenheck Fan Corporation
EM-40
2
3
4
5 6 7 8 9 10
x 1000
24
36
48
2500 fpm
36
48
EM-40 Rev 4 Aug 2008
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