Greenheck Fan Ventilation Hood EM 40 User Manual

Extruded BACKDRAFT DAMPER  
ADJUSTABLE COUNTERBALANCE  
EM-40 SERIES  
Horizontal Mount - Vertical Airflow Down  
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)  
H*  
differential pressure  
Velocity: 2500 to 3500 fpm (13m/s - 18 m/s)  
Temperature: 180°F (82ºC)  
Standard Construction  
Frame: Heavy gauge 6063T5 extruded aluminum.  
W*  
(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  
*W & H dimensions furnished approximately 1/4 in. (6mm) under size.  
Bearings: Synthetic (acetal) sleeve type  
Linkage: 1/8 in. (3mm) plated steel  
3 in.  
5 in.  
Blade Seals: Vinyl  
EM-40  
3 1/8 in.  
No Flange  
11 1/8 in.  
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)  
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.  
EM-41  
Flange On  
Discharge  
1 1/2 in.  
Options and Accessories  
• 11/2 in. flange on discharge: EM-41  
1 1/2 in.  
• 11/2 in. flange on intake:  
EM-42  
EM-42  
Flange On  
Intake  
• 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:  
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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