Greenheck Extruded Backdraft Damper EM-40 Manuale utente
Application and Design
The EM-40 series is a horizontally mounted backdraft damper that is designed to allow vertical airflow down and prevent
reverse airflow. The damper is opened by air pressure differential and closed by gravity. Standard models include adjustable
counterbalance weights to assist closing.
Ratings (See page 2 for specific limitations)
Pressure: 4.0 - 10.0 in. wg (996 Pa - 2491 Pa)
differential pressure
Velocity: 2500 to 3500 fpm (13m/s - 18 m/s)
Temperature: 180°F (82ºC)
Standard Construction
Frame: Heavy gauge 6063T5 extruded aluminum.
(0.125 in.[3.2mm] thickness)
Blades: Heavy gauge 6063T5 extruded aluminum.
(0.070 in. [1.8mm] thickness)
Axles: 3
/4in. (19mm) dia. metallic
Bearings: Synthetic (acetal) sleeve type
Linkage: 1
/8in. (3mm) plated steel
Blade Seals: Vinyl
Size Limitations
Minimum Size: 8 in. W x 11 in. H
(203mm x 279mm)
Maximum Panel Size: 48 in. W x 74 in. H
(1219mm x 1880mm)
Options and Accessories
• 11
/2in. flange on discharge: EM-41
• 11
/2in. flange on intake: EM-42
• APC(AdjustablePressureController).
Allowsfieldsettingofreliefpressureon
all EM dampers. Use one per panel.
Maximum recommended pressure set
limitations are as follows:
EM-40 SERIES
Horizontal Mount - Vertical Airflow Down
Sizes larger than maximum shown will be supplied
as two or more equal size smaller dampers required
to make up the size specified. These larger multiple
damper assemblies require field assembly and may
require additional reinforcement (not supplied by
Greenheck) to support the assembly.
*W & H dimensions furnished approximately 1
/4in. (6mm) under size.
Extruded BACKDRAFT DAMPER
ADJUSTABLE COUNTERBALANCE
3
1
/
8
in.
Airflow
1
1
/
2
in.
1
12
in.
3 in.
5 in.
11
1
/
8
in.
/
EM-40
No Flange
EM-41
Flange On
Discharge
EM-42
Flange On
Intake
Area ft2
(m2)
Maximum Set
Pressure
in. wg (Pa)
4 (.37) .75 (187)
6 (.56) .50 (125)
8 (100) .40 (100)
10 (.93) .30 (75)
15 (1.39) .20 (50)
20 (1.86) .15 (37)
24 (2.23) .125 (31) Counterbalance weights may require field adjustment. Instructions are
available at www. greenheck.com.
W*
H*
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 31Ú8in. (79mm) depth; blades from 0.070 in.(1.8mm)
6063T5 extruded aluminum; 3/4in. (19mm) dia. metallic axles
turning in acetal bearings; damper shall be equipped with
extruded vinyl blade seals; and internal 1
/8in. (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 (18 m/s) and temperatures to 180°F
(82ºC).TestingandratingstobeinaccordancewithAMCA
Standard 500-D. Basis of design is Greenheck model EM-40.
Velocity (fpm)
1
x 10
Pressure Loss ( In. wg)
10
9
8
7
6
5
4
3
2
2 3 4 5 6 7 8 910
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 8 910
x 1000
2 3 4 5 6 7 8 910
Pressure Drop
Performance data results from testing a 36 in. x 36 in.
(914mmx914mm)damperinaccordancewithAMCAStandard
500-DusingFigure5.7A(unducted).Alldatahasbeencorrected
to represent standard air at 0.075 lb/ft3(1.201 kg/m3).
Pressure Limitations
Velocity Limitations
Pressure (in. w.g.)
483624120
8
6
4
2
0
4.0 in. w.g.
6.0 in. w.g.
Damper Width (in.)
10
8.0 in. w.g.
10.0 in. w.g.
012243648
0
60
74
3000 fpm
2500 fpm
Damper Height (in.)
Damper Width (in.)
3500 fpm
36
140
1.0
.9
.8
.7
.6
.5
.4
.3
.2
6
5
4
3
2
Static Pressure Difference
Air Leakage in CFM/Sq. Ft.
1 2 3 4 5 6 7 8 910 20 30 40 50 60
Static Pressure Difference
1.0
.9
.8
.7
.6
.5
.4
.3
.2
10
9
8
7
6
5
4
3
2
Air Leakage in CFM/Sq. Ft.
1 2 3 4 5 6 7 8 910 20 30 40 50 60 70 80 90 100 150
EM-10
Air Leakage in CFM/Sq. Ft.
1 2 3 4 5 6 7 8 9
10
20 30 40 50 60 70 80 90100 150
1.0
.9
.8
.7
.6
.5
.4
.3
.2
8.5
8
7
6
5
4
3
2
Static Pressure Difference
130
With Seals
Without Seals
LeakagetestingwasconductedinaccordancewithAMCA
Standard 500-D and is expressed as CFM per sq. ft. of damper
facearea.Alldatahasbeencorrectedtorepresentstandardair
at 0.075 lb/ft3 (1.201 kg/m3).
Leakage
36 in. x 36 in. Damper
Copyright © 2008 Greenheck Fan Corporation
EM-40Rev4Aug2008
Performance Data EM-40
Operational Data ÆP in. wg
(Pa)
Veloc-
ity fpm
(m/s)
Damper with Standard
Bearings
Blades Start to Open 0.07 (17) 50 (.254)
Blades Fully Open 0.20 (50) 1200 (6.2)
Indice
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