Greenheck Fan BR-30 Series Prospecto

Application and Design

The BR-30 series is an eccentrically pivoted backdraft damper for low velocity systems. BR-30 series is a vertical mounted
damper and designed to allow horizontal airflow and prevent reverse airflow. To increase sensitivity and reduce blade mounted
counterbalance, the blade skin is formed aluminum. On-blade counterweights are provided to fine tune start-to-open and full
open blade operation. Ball bearings minimize friction.

Recommended Applications:

• Gravity hood intake and exhaust

• Stairwell pressurization
• Room pressurization
• Ductwork outlets

Poor Applications:

• Propeller fan outlets (high velocity)
• Centrifugal fan outlets (high velocity)
• Building pressurization (sensitive to wind)
• Pressure relief exceeding 0.13 in. wg (32 Pa)

Ratings

Back Pressure: 2.0 in. wg (500 Pa)

Start-to-Open Pressure: 0.05 in. wg (12 Pa)

Velocity: 2000 fpm (10.2m/s)

Temperature: 180°F (82ºC)

Standard Construction

Frame: Insert mount 16 ga. (1.5mm) galvanized steel

hat channel

Blades: 0.063 in. (1.6mm) thick formed aluminum,

eccentrically pivoted

Axles:

in. (9.5mm) square plated steel

Bearings: Galvanized steel press-fit ball

Linkage: Side mounted (out of airstream)

Blade Seals: Pressure activated vinyl

Counterbalance: Blade mounted with adjustable

weights

Size Limitations

Minimum Size:

8 in. W x 6 in. H
(203mm x 152mm)

Maximum Panel Size:

48 in. W x 74 in. H

(1220mm x 1880mm)

Options

• EPDM segmented jamb seals
• Stainless steel or aluminum frame
• Stainless steel axles and linkage
• Type 316 ball bearings with acetal races
• Selectable start open from .05 to .13 in. wg (12 Pa - 32 Pa)

BR-30 SERIES

Vertical Mount Horizontal Airflow

BAROMETRIC RELIEF DAMPER

ADJUSTABLE COUNTERBALANCE

DAMPERS AND LOUVERS

*W & H dimensions furnished approximately

in.(6mm) under size.

1.5 in.

5 in.

1 in.

MAX

4 3/8 in.

MAX

1.5 in.

BR-30
No flange

BR-31
Flange on
Discharge

BR-32
Flange on
Intake

Airflow