PN 471558
®
Downblast Centrifugal Roof Exhaust Fans
Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions
could result in personal injury and/or property damage! Retain instructions for future reference.
Model G
Model GB
Belt Drive
Direct Drive
Model G is a direct drive downblast
GB Model Fans are belt drive
downblast centrifugal exhaust fans.
centrifugal exhaust fan. These
fans are specifically designed
These fans are specifically designed
for roof mounted applications
for roof mounted applications
exhausting relatively clean air.
exhausting relatively clean air.
Performance capabilities range
Performance capabilities range up
up to 4,300 cfm (7,305 m3/hr) and
to 44,700 cfm (75,950 m3/hr) and
up to 1 in. wg (249 Pa) of static
up to 2.5 in. wg (623 Pa) of static
pressure. The maximum continuous
pressure. The maximum continuous
operating temperature is 180°F
operating temperature is 180°F
(82ºC). G models are available
(82ºC). GB models are available in
in 27 sizes with nominal wheel
twenty sizes with nominal wheel
diameter ranging from 8 to 24 inches (203 to 610 mm)
(060 - 243 unit sizes). Each fan shall bear a permanently
affixed manufacturer’s engraved metal nameplate
containing the model number and individual serial
number. All fans are UL/cUL listed Standard 705.
diameters ranging from 11 to 54 inches (279 to 1372 mm)
(071-540 unit sizes). Each fan shall bear a permanently
affixed manufacturer’s nameplate containing the model
number and individual serial number. All fans are
UL/cUL listed Standard 705.
General Safety Information
1. Follow all local electrical and safety codes, as well as
the National Electrical Code (NEC) and the National
Fire Protection Agency (NFPA), where applicable.
Follow the Canadian Electric Code (CEC) in Canada.
Only qualified personnel should install this fan. Personnel
should have a clear understanding of these instructions
and should be aware of general safety precautions.
Improper installation can result in electric shock, possible
injury due to coming in contact with moving parts, as
well as other potential hazards. Other considerations
may be required if high winds or seismic activity are
present. If more information is needed, contact a licensed
professional engineer before moving forward.
2. The rotation of the wheel is critical. It must be
free to rotate without striking or rubbing any
stationary objects.
3. Motor must be securely and adequately grounded.
4. Do not spin fan wheel faster than max cataloged fan
RPM. Adjustments to fan speed significantly affects
motor load. If the fan RPM is changed, the motor
current should be checked to make sure it is not
exceeding the motor nameplate amps.
DANGER
Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power
source can result in fire, shock or serious injury.
5. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces or chemicals.
Replace cord immediately if damaged.
CAUTION
When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.
6. Verify that the power source is compatible with
the equipment.
7. Never open access doors to a duct while the fan
is running.
CAUTION
Precaution should be taken in explosive atmospheres.
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1
Inspection and Maintenance
During Storage
Storage
Fans are protected against damage during shipment. If
the unit cannot be installed and operated immediately,
precautions need to be taken to prevent deterioration of
the unit during storage. The user assumes responsibility
of the fan and accessories while in storage. The
manufacturer will not be responsible for damage during
storage. These suggestions are provided solely as a
convenience to the user.
While in storage, inspect fans once per month. Keep a
record of inspection and maintenance performed.
If moisture or dirt accumulations are found on parts,
the source should be located and eliminated. At each
inspection, rotate the wheel by hand ten to fifteen
revolutions to distribute lubricant on motor. If paint
deterioration begins, consideration should be given to
touch-up or repainting. Fans with special coatings may
require special techniques for touch-up or repair.
Indoor
The ideal environment for the storage of fans and
accessories is indoors, above grade, in a low humidity
atmosphere which is sealed to prevent the entry of
blowing dust, rain or snow. Temperatures should be
evenly maintained between 30° to 110°F (-1° to 43°C)
(wide temperature swings may cause condensation
and “sweating” of metal parts). All accessories must be
stored indoors in a clean, dry atmosphere.
Machined parts coated with rust preventive should be
restored to good condition promptly if signs of rust
occur. Immediately remove the original rust preventive
coating with petroleum solvent and clean with lint-free
cloths. Polish any remaining rust from surface with
crocus cloth or fine emery paper and oil. Do not destroy
the continuity of the surfaces. Thoroughly wipe clean
with Tectyl® 506 (Ashland Inc.) or the equivalent.
For hard to reach internal surfaces or for occasional
use, consider using Tectyl® 511M Rust Preventive,
WD-40® or the equivalent.
Remove any accumulations of dirt, water, ice or snow
and wipe dry before moving to indoor storage. To avoid
“sweating” of metal parts, allow cold parts to reach room
temperature. To dry parts and packages, use a portable
electric heater to get rid of any moisture buildup. Leave
coverings loose to permit air circulation and to allow for
periodic inspection.
Removing From Storage
As fans are removed from storage to be installed in their
final location, they should be protected and maintained
in a similar fashion until the fan equipment goes into
operation.
The unit should be stored at least 3½ inches (89 mm)
off the floor on wooden blocks covered with moisture
proof paper or polyethylene sheathing. Aisles between
parts and along all walls should be provided to permit air
circulation and space for inspection.
Outdoor
Fans designed for outdoor applications may be stored
outdoors, if absolutely necessary. Roads or aisles for
portable cranes and hauling equipment are needed.
The fan should be placed on a level surface to prevent
water from leaking into the fan. The fan should be
elevated on an adequate number of wooden blocks so
that it is above water and snow levels and has enough
blocking to prevent it from settling into soft ground.
Locate parts far enough apart to permit air circulation,
sunlight and space for periodic inspection. To minimize
water accumulation, place all fan parts on blocking
supports so that rain water will run off.
Do not cover parts with plastic film or tarps as these
cause condensation of moisture from the air passing
through heating and cooling cycles.
Fan wheels should be blocked to prevent spinning
caused by strong winds.
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3
®
Installation
WARNING
Typical Roof Mounting Installation
Installation, troubleshooting and parts replacement is
to be performed only by qualified personnel.
1. On the roof surface, cut an appropriate sized hole
and follow manufacturer’s instructions on curb
installation. Caulk and flash the curb to ensure a
water tight seal.
WARNING
Disconnect power before installing or servicing.
CAUTION
2. If unit is equipped with a backdraft damper, it should
be installed now.
3. Remove motor cover. Access to the motor
compartment is accomplished by removing the
screws as shown in Figure 3.
A fan manufactured with an explosion resistant motor
does not certify the entire unit to be explosion proof.
4. Only on GB Belt Drive fans. On the drive frame use
the lifting lugs to lift and place the unit on top of roof
curb. (Refer to Figure 2 on page 2).
5. Secure fan to curb using a minimum of eight lag
screws, metal screws or the suitable fasteners.
Shims may be required depending upon curb
installation and roofing material.
Note: Severe duty applications may require
additional fasteners.
6. Verify power line wiring is de-energized before
connecting fan motor to power source.
7. Connect power supply wiring to the motor as
indicated on the motor nameplate or terminal box
cover. Check the power source for compatibility with
the requirements of your equipment.
8. Check fan wheel for free rotation, re-center
if necessary.
9. Check all fasteners for tightness.
10. Mount and wire safety disconnect switch under
motor cover. Wire control switches at ground level,
refer to Figure 4.
11. Replace motor cover.
Typical Wiring Diagram
MOTOR
MOTOR
SUPPLY VOLTAGE
115/208-230/60/1
SUPPLY VOLTAGE
208-230/460/60/3
J-BOX
J-BOX
L1
L2
L3
L1
L2
Figure 4
Vari-Green Wiring
For Vari-Green wiring refer to the Vari-Green
Motor IOM PN 473681 for complete wiring and
operation instructions.
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4
®
G - Direct Drive
G Direct Drive
Figure 5 - Typical Roof Mounting Installation
Curb
Roof
Opening
*Approx.
Weight
Model
Damper
Cap
G 060, 065, 070, 075
G 080, 085, 090, 095
G 97, 98, 99
17 (432)
8 (203)
10½ (267)
18 (8)
26 (12)
57 (26)
62 (28)
65 (30)
66 (30)
76 (35)
80 (36)
Disconnect
17 (432)
19 (483)
19 (483)
19 (483)
19 (483)
22 (559)
22 (559)
30 (762)
30 (762)
10 (254) 12½ (267)
12 (305) 14½ (368)
12 (305) 14½ (368)
12 (305) 14½ (368)
12 (305) 14½ (368)
16 (406) 18½ (470)
16 (406) 18½ (470)
Screws
G 103, 103 HP
G 123
G 133
G 143, 143 HP
G 163, 163 HP
G 183, 183 HP
G 203, 203 HP
¾ in.
8 or 12 in.
(203 or 305)
(19)
Wiring by Others
18 (457) 20½ (521) 119 (54)
18 (457) 20½ (521)
24 (610) 26½ (673)
130 (59)
150 (68)
Damper
Recommended Duct
and Damper Size
G 223/243, 223/243 HP 34 (864)
1¼ in.
(32)
1¼ in.
(32)
*Dimensions shown
in inches (mm)
Recommended Roof
Opening
GB - Belt Drive
Curb
Roof
Damper
*Approx.
Weight
Model
Cap
Opening
GB 071, 081, 091
GB 101, 101HP
GB 121
19 (483)
19 (483)
19 (483)
19 (483)
22 (559)
22 (559)
30 (762)
30 (762)
12 (305) 14½ (368)
12 (305) 14½ (368)
12 (305) 14½ (368)
12 (305) 14½ (368)
16 (406) 18½ (470)
16 (406) 18½ (470)
58 (26)
63 (29)
66 (30)
67 (30)
83 (38)
89 (40)
GB Belt Drive
Figure 6 - Typical Roof Mounting Installation
GB 131
GB 141, 141HP
GB 161, 161HP
GB 180, 180HP
GB 200, 200HP
Disconnect
18 (457) 20½ (521) 125 (57)
18 (457) 20½ (521) 138 (63)
GB 220, 220HP,
240, 240HP
34 (864)
24 (610) 26½ (673) 158 (72)
GB 260
40 (1016) 30 (762) 32½ (826) 305 (138)
40 (1016) 30 (762) 32½ (826) 320 (145)
46 (1168) 36 (914) 38½ (978) 385 (175)
46 (1168) 36 (914) 38½ (978) 403 (183)
52 (1321) 42 (1067) 44½ (1130) 495 (225)
52 (1321) 48 (1219) 50½ (1283) 623 (283)
64 (1626) 54 (1372) 56½ (1435) 687 (312)
64 (1626) 54 (1372) 56½ (1435) 748 (339)
¾ in.
8 or 12 in.
(203 or 305)
(19)
GB 300, 300HP
GB 330
Wiring by Others
GB 360, 360HP
GB 420
Damper
Recommended Duct
and Damper Size
1¼ in.
(32)
1¼ in.
(32)
GB 480
Dimensions shown
Recommended Roof
Opening
in inches (mm)
GB 500
GB 540
•
All dimensions are in inches (millimeters). *Approximate weight shown in pounds
(kilograms) is the largest cataloged Open Drip Proof motor.
•
The roof curb should be 1½ in. (38 mm) less than the curb cap to allow for roofing
and flashing.
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®
Pre-Starting Checks
1. Check all fasteners and set screws for tightness. The
wheel should rotate freely and be aligned as shown
in Figure 7 below.
Wheel Rotation
Clockwise
Rotation
All Models
2. Wheel position is preset and the unit is test run at the
factory. Movement may occur during shipment and
realignment may be necessary.
3. Only G unit - Centering height alignment can be
accomplished by loosening the set screws in the
wheel and moving the wheel to the desired position.
Figure 8
4. Only GB unit - Centering can be accomplished by
loosening the bolts holding the drive frame to the
shock mounts and repositioning the drive frame.
WARNING
5. Only GB unit - Wheel and inlet cone overlap can be
adjusted by loosening the set screws in the wheel
and moving the wheel to the desired position.
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible burnout.
6. Only GB unit - Fan RPM should be checked and
verified with a tachometer.
WARNING
The fan has been checked for mechanical noises at the
factory prior to shipment. If mechanical noise should
develop, suggested corrective actions are offered in
the Troubleshooting section.
7. Check wheel rotation (viewing from the shaft side)
by momentarily energizing the unit. Rotation should
be clockwise as shown in Figure 8 and correspond
to rotation decal on the unit. If wheel rotation is
incorrect, reverse two of the wiring leads or check
motor wiring for single phase.
IMPORTANT
Over tightening will cause excessive bearing wear and
noise. Too little tension will cause slippage at startup
and uneven wear.
Wheel Overlap and Gap Dimensions
Model
060-095
G - Overlap in. (mm) H - Gap in. (mm)
Model GB
Pre-Starting Belt Tension Checks
8. Always loosen tension enough to install belts without
stretching, see Figure 9.
G
G
–
3⁄32 (2)
1
1
97-163
GB 071-161
183-243
⁄
4
4
(6)
–
–
–
–
–
⁄
(6)
3
G
⁄8
⁄8
⁄2
(10)
(10)
(13)
3
GB 180-240
GB 260-540
Belts
1
Do not force belt(s). Forcing the
belt(s) will break the cords and
cause belt failure
Figure 9
G
H
Figure 7
9. For units with two groove pulleys, adjust so the
tension is equal in both belts.
10. If adjustments are made, it is very important to check
the pulleys for proper alignment. Misaligned pulleys
lead to excessive belt wear vibration, noise and
power loss, see Figure 10.
Figure 10
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®
IMPORTANT
Fasteners
(4) *Fasteners
Adjust (tighten) belt tension after the first 24-48 hours
of operation.
*Identical fasteners on
opposing side must also
be loosened.
Inspection
Inspection of the fan should be conducted at the first
30 minute and 24 hour intervals of satisfactory operation.
Figure 11
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts.
Adjust and tighten as necessary.
11. Belt tension can be adjusted by loosening four
fasteners on the drive frame, see Figure 11. The
motor plate slides on the slotted adjusting arms
and drive frame angles in the same manner.
24 Hour Interval
Check all internal components. On GB unit only, inspect
belt alignment and tension. Adjust and tighten as
necessary.
12a. Sizes 071-161: Belts should be tensioned just
enough to prevent slippage at full load.
Note: Belts should have a slight bow on the slack
side while running at full load (see Figure 12a).
Maintenance: G / GB
Installation and maintenance are to be performed only
by qualified personnel who are familiar with local codes
and regulations and who are experienced with this type
of equipment.
Deflection
Slack
Side
Motor maintenance is generally limited to cleaning and
lubrication (where applicable). Cleaning should be limited
to exterior surfaces only. Removing dust buildup on
motor housing ensures proper motor cooling.
Figure 12a
Figure 12b
12b. Sizes 180-540: Belt tension should be adjusted to
allow 1⁄64 in. (0.397 mm) of deflection per inch of belt
span. For example, a 15 in. (381 mm) belt span should
have 15⁄64 in. (0.234 mm) (or about 1⁄4 in. (6 mm)) of
deflection with moderate thumb pressure at mid-point
between pulleys (see Figure 12b).
WARNING
Always disconnect, lock and tag power source before
servicing. Failure to disconnect power source can
result in fire, shock or serious injury.
13. The adjustable motor pulley is factory set for the
RPM specified. Speed can be increased by closing
or decreased by opening the adjustable motor pulley.
Greasing of motors is only intended when fittings are
provided. Many fractional horsepower motors are
permanently lubricated and should not be lubricated
after installation. Motors supplied with grease fittings
should be greased in accordance with manufacturers’
recommendations. Where motor temperatures do not
exceed 104ºF (40ºC), the grease should be replaced after
2,000 hours of running time as a general rule.
14. Any increase in speed represents a substantial
increase in the horsepower required by the unit.
15. Motor amperage should always be checked to avoid
serious damage to the motor when speed is varied.
Operation: G / GB
1. Before starting up or operating fan, check all
fasteners for tightness. In particular, check the
setscrews in wheel hub.
Wheels require very little attention when moving clean
air. Occasionally, oil and dust may accumulate causing
imbalance. When this occurs, the wheel and housing
should be cleaned to ensure smooth and safe operation.
2. While in the OFF position or before connecting the
fan to power, turn the fan wheel by hand to be sure it
is not striking the venturi or any obstacle.
All fasteners should be checked for tightness each
time maintenance checks are performed prior to
restarting unit.
3. Start the fan and shut it off immediately to check
rotation of the wheel with directional arrow in the
motor compartment.
A proper maintenance program will help these units
deliver years of dependable service.
4. When the fan is started, observe the operation and
check for any unusual noises.
CAUTION
Uneven cleaning of the wheel will produce an out of
balance condition that will cause vibration in the fan.
5. With the system in full operation and all ductwork
attached, measure current input to the motor and
compare with the nameplate rating to determine if
the motor is operating under safe load conditions.
WARNING
This unit should be made non-functional when cleaning
the wheel or housing (fuses removed, disconnect
locked off).
6. Keep inlets and approaches to fan clean and free
from obstruction.
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11. During the first few months of operation, check
bearing setscrews periodically to ensure tightness.
Belt/Bearing Maintenance GB Unit
1. Belts tend to stretch after a period of time.
They should be checked periodically for wear and
tightness. When replacing belts, use the same type
as supplied with the unit.
12. If unit is to be left idle for an extended period,
remove belts and store in a cool, dry place to avoid
premature belt failure.
2. Matched belts should always be used on units with
multi-groove pulleys.
Recommended Relubrication
Frequency in Months
NOTE: If unusual environment conditions exist (extreme
temperature, moisture or contaminants) more frequent
lubrication is required.
3. For belt replacement, loosen the tensioning device
enough to allow removal of the belt by hand.
4. Once installed, adjust belts as shown in
“Pre-Starting Checks.”
A good quality lithium base grease, conforming to
NLGI Grade 2 consistency, such as those listed here
may be used.
5. Shaft bearings can be classified in two
groups: relubricating and non-relubricating. All
non-relubricating bearings on model GB fans are
factory lubricated and require no further lubrication
under normal use (between -20º to 180ºF (-29º to 82ºC)
in a relatively clean environment).
Table 2: Suggested Fan Bearing Greasing Intervals
Interval
Type of Service
(months)
Heavy duty in dirty, dusty locations; high ambient
1 to 3
6. On GB belt driven fans, the standard cast pillow
block bearings are factory lubricated and are
provided with external grease fittings. Annual
lubrication is recommended, or more frequently
if needed (See Table 2). Do not over-grease. Use
only one or two shots of lubricant with a hand gun.
Maximum hand gun rating is 40 psi. Rotate bearings
during lubrication where good safety practice
permits. Caution should be employed to prevent over
packing or contamination.
temperatures; moisture laden atmosphere; vibration.
12 to 24 hours per day, heavy duty, or if moisture is
present
3 to 6
8 to 16 hours per day in clean, relatively dry
atmosphere
6 to 12
Infrequent operation or light duty in clean
atmosphere
12 to 18
Table 3: Grease Manufacturers
Manufacturer
Grease (NLGI #2)
7. Grease fittings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
U.S. Electric Motors
Chevron U.S.A. Inc
Grease No. 83343
Chevron SRI Grease #2
Mobilith
8. Grease should be pumped in very slowly until a slight
bead forms around the seal. A high grade lithium
base grease should be used. (See Table 3)
Mobil Oil Corporation
Texaco, Inc.
Mobil 532
Premium BRB #2
Texaco Multifak #2
Rykon Premium #2
Unirex N2
9. To ensure tightness, check pulley setscrews. Proper
keys must be in keyways.
Amoco Oil Co.
Exxon
10. Fan RPM should not be readjusted. Only use pulleys
of identical size and type when replacing pulleys.
Shell
B Shell Alvania #2
Fan Inlet Connections
In order to assure proper fan performance, caution must be exercised in fan placement and connection to the
ventilation system. Obstructions, transitions, poorly designed elbows, improperly selected dampers, etc. can
cause reduced performance, excessive noise and increased mechanical stress. For performance to be as
published, the system must provide uniform and stable airflow into the fan.
Good
Poor
Poor
Good
Provide uniform airflow at fan inlet and through
the damper to assure optimum performance.
The curb cap should be three wheel diameters
from the radius. Use turning vanes in duct
when possible.
Dampers must open fully.
Use motorized dampers
in low airflow applications
to reduce losses.
Avoid sharp turns or
Provide uniform airflow
at fan inlet to assure
optimum performance.
entrance conditions which
cause uneven flow. Use
turning vanes in elbows to
reduce adverse effects.
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Troubleshooting
WARNING: Before taking any corrective action, make certain unit is not capable of operation during repairs.
PROBLEM
CAUSE
CORRECTIVE ACTION
Adjust wheel and/or inlet cone. Tighten wheel hub or bearing collars
on shaft.
Wheel rubbing inlet
Tighten pulleys on motor/fan shaft. Adjust belt tension. Align pulleys
properly, see page 6, Figure 9-10. Replace worn belts or pulleys.
V-belt drive
Bearings
Replace defective bearing(s). Lubricate bearings. Tighten collars
and fasteners.
Clean all dirt off wheel. Check wheel balance, rebalance in place if
necessary.
Wheel unbalance
Excessive noise
or vibration
Belts too tight or too loose
Adjust tension, see page 7, Figure 12a-b.
Wheel improperly aligned and
rubbing
Center wheel on inlet, see page 6, Figure 7.
Align and tighten. See “Pre-Starting Checks”, see page 6.
Loose drive or motor pulleys
Foreign objects in wheel or housing Remove objects, check for damage or unbalance.
Fan base not securely anchored
Motor hood loose and rattling
Defective or loose motor bearings
Fan
Secure properly.
Tighten screws securing motor hood.
Replace motor with same frame size, RPM-HP.
Check rotation of wheel, see page 6, Figure 8. Reduce fan speed.
High horsepower
Resize ductwork. Check proper operation of face and bypass dampers.
Check filters and access doors.
Duct system
Check fuses/circuit breakers. Check for switches off. Check for correct
supply voltage.
Electrical supply
Fan does
not operate
Drive
Check for broken belts. Tighten loose pulleys.
Motor
Assure motor is correct horsepower and not tripping overload protector.
Check for excessive or insufficient grease in the bearing.
Lubrication
Replace damaged bearing. Relieve excessive
belt tension. Align bearings. Check for bent shaft.
Mechanical
Adjust tension or replace bad belts, see page 6-7.
Contact power company.
Belt slippage
Over/Under line voltage
Incorrect wheel rotation
Motor overloads
or overheats
Check motor wiring (page 4) verify motor is wired for correct rotation.
Check drives or slow down fan by opening variable pitch pulley on
motor shaft.
Wheel RPM too high
Undersized motor
Check motor ratings with catalog speed and air capacity chart.
Check motor wiring to wiring diagram located on fan motor.
Motor wired incorrectly
Check system: Proper operation of backdraft or control dampers,
obstruction in ductwork, clean dirty filters.
System resistance too high
Unit running backwards
Excessive dirt buildup on wheels
Improper wheel alignment
Dampers closed
Correct as shown on page 6, Figure 8.
Clean wheel.
Center wheel on inlets, see Pre-Starting checks on page 6, Figure 7.
Inspect and repair.
Reduced airflow
Blocked duct/clogged filter
Belt slippage
Clean or replace.
Replace and adjust tension.
Check for correct drives.
Speed too slow
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Maintenance Documentation
Job Information
Job Name:__________________________________ Service Organization: _________________________________
Address: ___________________________________ Address:_____________________________________________
City: _______________________________________ City:_________________________________________________
State: ______________ Zip:__________________ State: _______________ Zip:__________________________
Phone: _____________________________________ Phone: ______________________________________________
Contact Person:_____________________________ Work Done By: _______________________________________
Nameplate Information
Field Start-Up Documentation
Model: _____________________________________
Volts:________ Hertz:________ Phase:______ Actual Voltage: _______ Hertz:______ Phase:_________
Amps:______________ Mark: ________________ Actual Amperage: ____________________________________
Supply hp:__________ Exhaust hp: __________ Blower Rotation: _____________________________________
Serial Number: ______________________________ Air Volume: Design cfm: _____________________________
Model Voltage: ______________________________
Actual cfm:______________________________
Motor Amperage: ___________________________ Level of fan (L or H): __________________________________
Fan RPM:___________________________________ Fan RPM Range (min.) ___________ (max.) _____________
Maintenance Log
Date
Time
Notes
Model G/GB Centrifugal Roof Exhaust Fans
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G Direct Drive Centrifugal Roof Exhaust Fan
Parts List
NOTE
Each fan bears a manufacturer’s name-
plate with model number and serial
number embossed. This information will
assist the local Greenheck representative
and the factory in providing service and
replacement parts. Before taking any
corrective action, make certain unit is
not capable of operation during repairs.
Motor Cover
Motor
Shock
Mounts
Hood Clip
Shroud
Shroud Brace
Birdguard
Wheel
Vertical
Support
Lower
Windband
Curb Cap/
Venturi
GB Belt Drive Centrifugal Roof Exhaust Fan
Motor Cover
Belt
Shaft Pulley
Motor Pulley
Bearings
Motor
Drive Frame
Assembly
Shock Mounts
Fan Shaft
Shroud
Wheel
Birdguard
Shroud Brace
Conduit
Chase
Windband
Vertical
Support
Curb Cap/
Venturi
Model G/GB Centrifugal Roof Exhaust Fans
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®
Roof Curb Installation
Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from
the shipment date. Any units or parts which prove defective during the warranty period will be replaced at our option
when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of
one year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the
nearest authorized motor service station. Greenheck will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Greenheck Catalog G/GB provides additional information
describing the equipment, fan performance, available
accessories, and specification data.
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be
®
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: [email protected] • Website: www.greenheck.com
471558 • Model G/GB IOM, Rev. 3, October 2010
Copyright 2010 © Greenheck Fan Corp.
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