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GB
Model GB is a belt drive centrifugal roof exhaust fan for general clean air applications where the air discharge is downward, toward the roof surface. The GB features a spun aluminum housing.
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Calculate Air Exchange (CFM)
Use the calculator to determine the Air Exchange (CFM) required to adequately ventilate an area.Enter information into the fields below in order to calculate the CFM (per fan).
To calculate the CFM required to adequately ventilate an area, we divide the room volume by the appropriate "Minutes per Change" value.
[CFM] = [Room Volume] / [Min./Chg.]
Airflow (CFM) per Fan
*
Starred items represent required fields.
Calculate Static Pressure (SP)
Use the calculator to determine the amount of static pressure the fan must overcome.The pressure generated by fans in ductwork is typically very small. An accurate measurement of static presure is critical to proper fan selection however. Static pressure in fan systems is typically less than 2" SP, or 0.072 Psi.
The amount of static pressure that the fan must overcome depends on the air velocity in the ductwork, the number of duct turns (and other resistive elements), and the duct length. For properly designed systems with sufficient make-up air, the guidelines in the table below can be used for estimating static pressure.
Static pressure
* Starred items represent required fields.
Static Pressure Guidelines
Non-Ducted 0.05" to 0.20"
Ducted 0.20" to 0.40" per 100 feet of duct (assuming duct air velocity falls within 1,000 to 1,800 feet per minute)
Fittings 0.08" per fitting (elbow, register, grill, damper, louver, duct turn, etc.)
Kitchen Hood Exhaust 0.625" to 1.50"
Important: Static pressure requirements are significantly affected by the amount of make-up air supplied to an area. Insufficient make-up air will increase static pressure and reduce the amount of air that will be exhausted. Remember, for each cubic foot of air exhausted, one cubic foot of air must be supplied.
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Showing 15 of 214 results
| SKU | DRIVE TYPE | HP | VOLTAGE | PHASE | CFM RANGE | FRPM RANGE | BASE/PANEL LENGTH x WIDTH | PRICE | ||
|---|---|---|---|---|---|---|---|---|---|---|
Model / Size: GB-071 | Belt Drive | 1/4 | 115 | 1 | 205-376 | 1310-1725 | 19 x 19 in | $753.22 | ||
Model / Size: GB-071 | Belt Drive | 1/6 | 115 | 1 | 109-248 | 900-1140 | 19 x 19 in | $747.52 | ||
Model / Size: GB-081 | Belt Drive | 1/4 | 115 | 1 | 527-864 | 1290-1725 | 19 x 19 in | $753.22 | ||
Model / Size: GB-081 | Belt Drive | 1/6 | 115 | 1 | 466-836 | 1305-1670 | 19 x 19 in | $747.52 | ||
Model / Size: GB-091 | Belt Drive | 1/4 | 115 | 1 | 483-952 | 969-1256 | 19 x 19 in | $753.22 | ||
Model / Size: GB-101 | Belt Drive | 1/3 | 115 208 230 | 1 | 572-788 | 840-930 | 19 x 19 in | $786.71 | ||
Model / Size: GB-101 | Belt Drive | 1/3 | 115 208 230 | 1 | 570-983 | 930-1160 | 19 x 19 in | $786.71 | ||
Model / Size: GB-101 | Belt Drive | 1/3 | 115 208 230 | 1 | 733-1220 | 1160-1440 | 19 x 19 in | $786.71 | ||
Model / Size: GB-101 | Belt Drive | 1/3 | 115 208 230 | 1 | 793-1526 | 1440-1800 | 19 x 19 in | $786.71 | ||
Model / Size: GB-101 | Belt Drive | 1/4 | 115 | 1 | 477-610 | 700-720 | 19 x 19 in | $770.32 | ||
Model / Size: GB-101 | Belt Drive | 1/4 | 115 | 1 | 519-754 | 720-890 | 19 x 19 in | $770.32 | ||
Model / Size: GB-101 | Belt Drive | 1/4 | 115 | 1 | 663-941 | 890-1110 | 19 x 19 in | $770.32 | ||
Model / Size: GB-101 | Belt Drive | 1/4 | 115 | 1 | 782-1170 | 1110-1380 | 19 x 19 in | $770.32 | ||
Model / Size: GB-101 | Belt Drive | 1/4 | 115 | 1 | 947-1458 | 1380-1720 | 19 x 19 in | $770.32 | ||
Model / Size: GB-101 | Belt Drive | 1/4 | 115 | 1 | 634-1186 | 1093-1400 | 19 x 19 in | $777.45 |
Centrifugal Downblast Exhaust Fan, Model GB-071, Belt Drive, 1/4HP, 115V, 1Ph, 376-205 CFM
$753.22
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
Centrifugal Downblast Exhaust Fan, Model GB-071, Belt Drive, 1/6HP, 115V, 1Ph, 109-248 CFM
$747.52
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
Centrifugal Downblast Exhaust Fan, Model GB-081, Belt Drive, 1/4HP, 115V, 1Ph, 527-864 CFM
$753.22
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
Centrifugal Downblast Exhaust Fan, Model GB-081, Belt Drive, 1/6HP, 115V, 1Ph, 466-836 CFM
$747.52
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
Centrifugal Downblast Exhaust Fan, Model GB-091, Belt Drive, 1/4HP, 115V, 1Ph, 483-952 CFM
$753.22
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/3HP, 115/208-230V, 1Ph, Motor & Drives Unassembled, 572-788 CFM
$786.71
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/3HP, 115/208-230V, 1Ph, Motor & Drives Unassembled, 570-983 CFM
$786.71
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/3HP, 115/208-230V, 1Ph, Motor & Drives Unassembled, 733-1220 CFM
$786.71
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/3HP, 115/208-230V, 1Ph, Motor & Drives Unassembled, 793-1526 CFM
$786.71
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/4HP, 115V, 1Ph, Motor & Drives Unassembled, 477-610 CFM
$770.32
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/4HP, 115V, 1Ph, Motor & Drives Unassembled, 519-754 CFM
$770.32
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/4HP, 115V, 1Ph, Motor & Drives Unassembled, 663-941 CFM
$770.32
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/4HP, 115V, 1Ph, Motor & Drives Unassembled, 782-1170 CFM
$770.32
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/4HP, 115V, 1Ph, Motor & Drives Unassembled, 947-1458 CFM
$770.32
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
- Motor, pulleys and belt ship separately for field assembly
Centrifugal Downblast Exhaust Fan, Model GB-101, Belt Drive, 1/4HP, 115V, 1Ph, 634-1186 CFM
$777.45
Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life.
- Centrifugal wheel provides high-efficiency and minimal sound
- True vibration isolation supports the motor and wheel for long life and quiet operation
- One-piece aluminum curb cap provides a weather-tight fit
- Positive motor cooling with fresh air results in maximum motor life
- Galvanized birdscreen protects the fan discharge from birds and small objects
Find by Performance
Our performance filter tool can help you choose the right product based on your performance requirements.
Filter Products
Applications/uses for a particular fan or ventilator.
Refers to the location where a fan or ventilator can be mounted.
Square base dimension on power roof ventilators. Square fan panel dimension on sidewall propeller fans.
Transmission type of the ventilator (belt drive or direct drive).
Indicates the space relationships of windings and changing values of the recurring cycles of AC voltages and currents. The most common power supplies are either single- or three-phase.
The force that causes a current to flow in an electrical circuit. The voltage of a motor is usually determined by the supply to which it is attached. NEMA requires that motor be able to carry its rated horsepower at nameplate voltage plus or minus 1% al
The power required to drive an air moving device. Horsepower required varies with system conditions.
The "ACTUAL" damper width and height. Dampers are undersized to allow them to be mounted into the duct work/wall opening.
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Version 1.0, April 2019
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