Greenheck Fan Ventilation Hood EM 30 Series User Manual

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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