Greenheck EM-30 Series User manual

Application and Design
The EM-30 series is a vertical mounted backdraft damper that is designed to
allow horizontal airflow and prevent reverse airflow. The damper is opened by
air pressure differential and closed by gravity.
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 (13 m/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 (without weights):8 in. W x 8 in. H
(203mm x 203mm)
Minimum Size (with weights):8 in. W x 11 in. H
(203mm x 279mm)
Maximum Size: 48 in. W x 74 in. H
(1219mm x 1880mm)
Options and Accessories
 • CounterbalanceWeights
 • APC(AdjustablePressureController).
  Allowsfieldsettingofreliefpressureon
all EM dampers. Use one per panel.
Maximum recommended pressure set
limitations are as follows:
(EM-30 damper must be equipped with counterbalance.)
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.
H*
W*
EM-30 SERIES
Vertical Mount - Horizontal Airflow
Extruded BACKDRAFT DAMPER
3
1
/
8
in.
Airflow
1
1
/
2
in. 1
1
/
2
in.
3 in.* 5 in.
11
1
/
8
in. * Optional counterbalance weights
dimensioned (
5
/
8
in. without weights).
EM-30
No Flange EM-31 Flange On
Discharge
EM-32
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eldadjustment.Instructionsare
available at www. greenheck.com.

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
31Ú8 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.
Pressure Drop
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/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 90100 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 90 100 150
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
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
at 0.075 lb/ft3 (1.201 kg/m3).
Leakage
36 in. x 36 in. Damper
Copyright © 2008 Greenheck Fan Corporation
EM-30Rev4Aug2008
Performance Data EM-30
Operational Data ÆP in. wg
(Pa)
Velocity
fpm (m/s)
Figure 5.3
Without Weight Blades Start to Open 0.03 (7.5) 10 (.05)
Blades Fully Open 0.25 (62) 2500 (12.7)
With Weights Blades Start to Open 0.01 (2.5) 10 (.05)
Blades Fully Open 0.055 (13.7) 1200 (6.1)
Figure 5.5
Without Weights Blades Start to Open 0.025 (6.2) 10 (.05)
Blades Fully Open 0.32 (8) 1200 (6.1)
With Weights Blades Start to Open 0.012 (3) 10 (.05)
Blades Fully Open 0.08 (20) 700 (3.6)
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 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 8 910
5.3*
5.3
5.5
5.5*
*With Counterbalance
Weights