Greenheck BR-30 User Manual

Application

4 3/8 in. MAX

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. The blade is formed aluminum which increases sensitivity and reduces blade mounted counterbalance weights. 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 0.3 in. wg (0.075 kPa)

Ratings

Back Pressure: 2.0 in. wg (0.5 kPa) Start -to-Open Pressure: 0.05 in. wg (.01 kPa)

Velocity: 2000 fpm (10.2 m/s) Temperature: 180°F (82°C)

Model BR-30 Series

Barometric Relief Dampers

Vertical Mount - Horizontal Airﬂow

• W & H dimensions furnished approximately 1/4 in. (6mm) undersize.

1.5 in.

Construction Standard Optional

Frame Material Galvanized Steel

Frame Thickness

Frame Type

Blade Material Aluminum -

Blade Seal TPE None

Blade Thickness

Axle Plated Steel 316SS

Axle Bearings Galvanized Ball Acetal w/SS Ball

Linkage Material Galvanized Steel -

Jamb Seal None EPDM

Counterbalance

Paint Finishes None

16 ga.

(1.5mm)

No Flange

(BR-30)

Flange on Discharge

(BR-31)

Flange on Intake

(BR-32)

0.063 in. (1.6mm)

Blade mounted with

adjustable weights

304SS,

Extruded Aluminum

Baked Enamel, Hi Pro Polyester, Industrial Epoxy

1 in. MAX

5 in.

BR-30

Flange

BR-31

Flange on

Discharge

BR-32

Flange on

Intake

Size Limitations

W x H

Inches 8 x 6 48 x 74 96 x 148

Minimum

Size

mm 203 x 152 1220 x 1880 2438 x 3759

Maximum Size

Single

Section

Feature

• Selectable start open from .05 to .30 in. wg (0.012 kPa - 0.075 kPa).

Airﬂow

Multiple

Sections

Installation instructions available at www.greenheck.com.

Performance Data BR-30 Series

Performance data results from testing a 12 in. x 12 in. and 36 in. x 36 in. (305mm x 305mm and 914mm x 914mm) in accordance with AMCA Standard 500-D using Figure 5.3 (fully ducted), 5.2 (ducted exhausting into an open area), and

5.5 (plenum mounted). All data has been corrected to represent standard air density at 0.075 lb/ft3 (1.201 kg/m3).

Pressure drop data shown is based on minimum start open pressure. Higher start open pressure will result in different pressure drop.

2.0

1.0 .9 .8

Pressure Drop (in. wg)

.09 .08

.07

.06

.05

.04

.03

100

Damper Size 12 in. x 12 in.

(305mm x 305mm)

200 300 400 500 600

Velocity

(fpm)

800

1000 2000 3000

700

900

Damper Size 36 in. x 36 in.

(914mm x 914mm)

2.0

5.5

5.2

5.3

1.0 .9 .8

Pressure Drop (in. wg)

.09 .08

.07

.06

.05

.04

.03

100

200 300 400 500 600

800

1000 2000 3000

700

900

5.5

5.2

5.3

Velocity

(fpm)

Speciﬁcations

Barometric backdraft dampers meeting the following speciﬁcations shall be furnished and installed where shown on plans and/or as described in schedules.

Dampers shall consist of: 16 ga. (1.5mm) insert mount galvanized steel hat channel frame with 5 in. (127mm) depth; blades from 0.063 in. (1.6mm) thick formed aluminum, eccentrically pivoted; 3⁄8 in. (9.5mm) square plated steel axles with galvanized steel press-ﬁt ball bearings; damper shall be equipped with pressure activated TPE blade seals; and internal plated steel blade-to-blade

linkage with blade mounted counterbalance weights.

Damper manufacturer’s printed application and performance data including pressure, velocity, and temperature limitations shall be submitted for approval showing damper suitable for pressures to 2 in. wg (0.5 kPa), velocities to 2000 fpm (10.2 m/s, and temperatures to 180°F (82°C). Testing and ratings to be in accordance with AMCA Standard 500-D.

Basis of design is model BR-30.

BR-30 Series Rev. 9 August 2020