Greenheck BR-30 Series User manual

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: 3
/8in. (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 1 /4in.(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
H*
W*

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; 3⁄8in. (9.5mm) square plated steel axles with galvanized
steel press-fit ball bearings; damper shall be equipped with pressure activated vinyl 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 (500 Pa), velocities to 2000 fpm (10.2m/s)
and temperatures to 180°F (82ºC). Testing and ratings to be in accordance with AMCA Standard 500D.
Basis of design is Greenheck model BR-30.
Performance data results from testing a 12 in. x 12 in. and 36 in. x 36 in. damper in accordance with AMCA Standard 500D
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).
BR-30 SERIESPERFORMANCE DATA
BR-30 series
Rev. 1 April 2004
Copyright © 2004 Greenheck Fan Corp.
Damper size
12 in. x 12 in.
Damper size
36 in. x 36 in.
Velocity (fpm)
Pressure Loss ( in. wg)
Velocity (fpm)
Pressure Loss ( in. wg)