Direct Drive, Model G - Greenheck G Manual

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
3
6,308 cfm (11,281 m
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.
48
/hr) and 1.75 in. wg (249 Pa) of
For models G-060 through G-095, the 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. The 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.