Extruded BACKDRAFT DAMPER
EM-30 SERIES
Vertical Mount - Horizontal Airflow
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)
H*
Standard Construction
Frame: Heavy gauge 6063T5 extruded aluminum.
(0.125 in. [3.2mm] thickness)
W*
Blades: Heavy gauge 6063T5 extruded aluminum.
(0.070 in. [1.8mm] thickness)
Axles: 3/4 in. (19mm) dia. metallic
*W & H dimensions furnished approximately 1/4 in. (6mm) under size.
Bearings: Synthetic (acetal) sleeve type
Linkage: 1/8 in. (3mm) plated steel
Blade Seals: Vinyl
11 1/8 in.
* Optional counterbalance weights
Size Limitations
dimensioned (5/8 in. without weights).
3 in.*
5 in.
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)
Airflow
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.
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:
1 1/2 in. 1 1/2 in.
31/8 in.
EM-30
EM-31
EM-32
Flange On
Intake
(EM-30 damper must be equipped with counterbalance.)
No Flange
Flange On
Discharge
Maximum Set
Pressure
in. wg (Pa)
2
Area ft
(m )
2
4 (.37)
6 (.56)
.75 (187)
.50 (125)
.40 (100)
.30 (75)
.20 (50)
.15 (37)
.125 (31)
8 (100)
10 (.93)
15 (1.39)
20 (1.86)
24 (2.23)
Counterbalance weights may require field adjustment. Instructions are
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