Greenheck Fan EM-40 dimensions Extruded BACKDRAFT DAMPER, Application and Design, EM-41, EM-42

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. (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

EM-40

No Flange

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	EM-41
as two or more equal size smaller dampers required
	Flange On
to make up the size specified. These larger multiple
	Discharge
damper assemblies require field assembly and may
require additional reinforcement (not supplied by
Greenheck) to support the assembly.

W*

*W & H dimensions furnished approximately 1/4 in. (6mm) under size.

		3 in.
3	1/8 in.	11 1/8 in.
		5 in.
		Airflow

11/2 in.

Options and Accessories

•11/2 in. flange on discharge: EM-41

• 11/2 in. flange on intake: EM-42

•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:

Area ft2		Maximum Set
		Pressure
(m2)
		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)

11/2 in.

EM-42

Flange On

Intake

Counterbalance weights may require field adjustment. Instructions are available at www. greenheck.com.