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Greenheck BR-30 Series Specification Sheet

Greenheck fan corporation barometric relief damper specification sheet

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DAMPERS AND LOUVERS
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
/
in. (9.5mm) square plated steel
8
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
Maximum Panel Size: 48 in. W x 74 in. H
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)
(203mm x 152mm)
(1220mm x 1880mm)
BAROMETRIC RELIEF DAMPER
Vertical Mount Horizontal Airflow
*W & H dimensions furnished approximately
4 3/8 in.
MAX
5 in.
ADJUSTABLE COUNTERBALANCE
BR-30 SERIES
W*
1
1.5 in.
1 in.
MAX
BR-30
BR-31
No flange
Flange on
Discharge
H*
/
in.(6mm) under size.
4
1.5 in.
Airflow
BR-32
Flange on
Intake

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Summary of Contents for Greenheck BR-30 Series

  • Page 1 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.
  • Page 2: Performance Data

    Basis of design is Greenheck model BR-30. (1.201 kg/m Damper size 36 in. x 36 in. Velocity (fpm) ⁄ in. (9.5mm) square plated steel axles with galvanized Copyright © 2004 Greenheck Fan Corp. BR-30 SERIES BR-30 series Rev. 1 April 2004...