Greenheck GM 30 User Manual

3 3⁄8 in.

Airflow

1 1⁄2 in. 1 1⁄2 in.

3 in.

11 1⁄8 in.

4 3⁄4 in.

3 1⁄2 in.

H*

W*

Vertical Mount - Horizontal Airflow

Application and Design

The GM-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 with assistance from
fully adjustable counterbalance weights to minimize pressure loss. The
damper is closed by gravity.

Ratings
Pressure: 4.0 in. wg (1 kPa) - differential pressure.

Velocity:

Temperature:

Standard Construction

Frame: 18 ga. (1.3mm) galvanized steel.

Blades:

(0.070 in. [1.8mm] thickness)

Axles:

Bearings: Synthetic (acetal) sleeve type.

Linkage:

Blade Seals: Vinyl.

2500 fpm (13 m/s)

180°F (82°C)

Heavy gauge 6063T5 extruded aluminum.

1/2 in. (13mm) dia. reinforced nylon.

1/8 in. (3mm) plated steel.

GM 30 SERIES

BACKDRAFT DAMPER

Size Limitations

Minimum Size: 11 in. W x 11 in. H

(279mm W x 279mm H)

Maximum Size: 48 in. W x 74 in. H

(1219mm W x 1880mm H)

Options and Accessories

• 1

• 11/2 in. flange on intake: GM-32

1

/2 in. flange on discharge: GM-31

*W & H dimensions furnished approximately 1/8 in. (3mm) under size.

GM-30

No Flange

GM-31

Flange On Discharge

GM-32

Flange On

Intake

Copyright ©2006 Greenheck Fan Corporation

GM Series Rev 3 December 2006