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Models G and GB
Spun Aluminum • Downblast
Centrifugal Roof Exhaust Fans
Greenheck models G and GB centrifugal roof
exhaust provide the industry’s best performance and
durability for general clean air applications where air is
discharged downward, toward the roof surface.
• Broadest performance in the industry, up to
3.25in.wg (810 Pa) and 45,000 cfm (76,500 m
3
/hr).
• Most advanced motor cooling of any fan in its class.
• Performance as cataloged is assured. All fan sizes
are tested in our AMCA Accredited Laboratory, and
all models are licensed to bear the AMCA Sound
and Air Performance seals.
• UL Listed for electrical.
• Greenheck subjects these products to extensive life
testing, assuring you that the fans will provide years
of reliable performance.
Direct Drive, G
• Use for short and/or low resistance ductwork
Belt Drive, GB
• For average length and/or average
resistance ductwork
• High volume/average pressure
High Pressure, GB-HP and G-HP
• For long and/or high resistance ductwork
• Low volume/high pressure
3
Model Comparison
Model
Location Mounting Airow Application
Drive
Type
Impeller
Type
Performance
Relative Cost
Outdoor
Indoor
Roof Curb
Base/Floor
Hanging
Wall
Ceiling Mounted
Exhaust
Supply
Reversible
Recirculate
General/Clean Air
Contaminated Air
Spark Resistant
Grease (UL 762)
Smoke Control (UL)
**
High Wind (150 mph)*
Continuous High Temp
(above 200°F )
Belt
Direct
Centrifugal
Propeller/Axial
Mixed Flow
Maximum Volume
(cfm)
Maximum Static
Pressure
(in. wg)
G
6,308 1.5 $
GB
44,700 3.25 $
*High wind limited to sizes 300 and smaller
**Smoke Control available on models: 101, 101HP, 121, 131, 141, 141HP, 161, 161HP, 200, 240, 300, 360, 420 and 480.