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
/
4
in. (19mm) dia. metallic
Bearings:
Synthetic (acetal) sleeve type
Linkage:
1
/
8
in. (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
/
4
in. (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 field adjustment. Instructions are
available at www. greenheck.com.
