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Direct Drive Specifications
Model G
Spun aluminum downblast exhaust fans shall
be direct drive type. These fans are specifically
designed for roof mounted applications exhausting
relatively clean air. Performance capabilities range
up to 6,640 cfm (11,281 m
3
/hr) and 1 in. wg (249Pa) of
static pressure. The maximum continuous operating
temperature shall be 180°F (82°C). Model G fans are
available in 20 sizes with nominal wheel diameters
ranging from 7 to 20 inches (178 to 457 mm) (060-203
unit sizes).
Each fan shall bear a permanently affixed
manufacturer’s engraved metal nameplate
containing the model number and individual
serial number.
All fans shall bear the AMCA Sound and Air
Performance seal.
The fan wheel shall be centrifugal non-overloading
backward-inclined, constructed of aluminum and
shall include a wheel cone carefully matched to the
inlet cone for precise running tolerances. Wheels
shall be statically and dynamically balanced in
accordance to AMCA Standard 204-05.
For models G-060 through G-095, fan shall have
sleeve bearing motors, carefully matched to the
fan load, and furnished at specified voltage, phase
and enclosure. For models G-097 through G-203,
motors shall be heavy-duty ball bearing type,
carefully matched to the fan load, and furnished at
the specified voltage, phase and enclosure. Models
G-060 through G-095 have three-speed motors as
standard. Motors shall be mounted on true vibration
isolators, out of the airstream. Fresh air for motor
cooling shall be drawn into the motor compartment
from an area free of discharge contaminants. Motors
shall be readily accessible for maintenance. True
vibration isolators shall be double-studded with no
metal-to-metal contact. Each vibration isolator shall
be sized to match the weight of each fan.
The fan housing shall consist of the motor cover,
shroud, curb cap and lower windband, and shall
be constructed of heavy-gauge aluminum. Housing
shall have a rigid internal support structure and
leakproof design. The fan shroud shall be one piece
with a rolled bead for extra strength which directs
exhaust air downward. The lower windband shall be
one piece with formed edges for added strength and
the curb cap shall include prepunched mounting
holes to ensure correct attachment.
A disconnect switch is a positive electrical shutoff
and shall be wired from the fan motor to a junction
box installed within the motor compartment. Factory
standard shall be a NEMA-1 disconnect switch
with other NEMA rated options also available.
Disconnect switches shall be factory mounted and/
or shipped loose for field mounting.
Options and accessories shall include: curb
extension, curb seal, dampers, finishes, hinge kit,
hinge base, pressure probe, roof curbs, and tie-down
points.
Fans shall be model G as manufactured by Greenheck
Fan Corporation of Schofield, Wisconsin, USA.