Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB - Manual (Page 3)

Models G and GB
Spun Aluminum • Downblast
Centrifugal Roof Exhaust Fans
Greenheck models G and GB centrifugal roof exhaust
fans 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
3.25 in. 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 Airflow Application
Drive
Type
Impeller Type Performance
Relative Cost Outdoor Indoor Roof Curb Base/Floor Hanging W
all
Ceiling Mounted Exhaust Supply Reversible Recir
culate
General/Clean Air Contaminated Air Spark Resistant Gr
ease (UL 762)
Smoke Contr
ol (UL)
*
High Wind
**
Continuous High T
emp
(above 200°F
)
Belt Dir
ect
Centrifugal Pr
opeller/Axial
Mixed Flow Maximum V
olume
(cfm) Maximum Static Pr
essur
e (in. wg)
G
9 9 9 9 9 9 9 9
6,308 1.75 $
GB
9 9 9 9 9 9 9 9 9
44,700 3.25 $
* Smoke Control available on models: 101, 101HP, 121, 131, 141, 141HP, 161, 161HP, 200, 240, 300, 360, 420 and 480.
** High wind limited to sizes 300 and smaller