FumeJet
®
Fume Exhaust Fans
4
®
Air Pressure and Suction
In addition to the usual hazards associated with rotating
machinery, fans also create a dangerous suction at the
inlet. Special caution needs to be used when moving
around a fan, whether it is in operation or not. Before
start-up, make sure the inlet area is clear of personnel
and loose objects.
To ensure a successful installation, the instructions in
this manual should be read and adhered to. Failure to
comply with proper installation procedures may void the
warranty.
Unit and System Identification Tags
Each fan has a permanently affixed manufacturer’s
engraved metal nameplate containing the model
number and individual serial number.
The tag shown is
an example of an
identification nameplate
on the fan. The
information provides
general details about
the fan, as well as containing specific information
unique to the unit. When contacting your Greenheck
representative with future needs or questions, please
have the information on this label available. Tags are
mounted in an area which is clearly visible, usually on
the side of the fan cabinet.
Pre-Installation Information
Before installation, it is important to be certain the
mounting surface will bear the operating weight of the
unit. For proper unit operation, it is also important that it
be operated in a completely level position.
For further details on safety practices involving
industrial and commercial fans, please refer to AMCA
Publication 410.
Electrical Disconnects
All fan motors should have disconnects located in close
visual proximity to turn off electrical service. Service
disconnects shall be locked-out when maintenance is
being performed.
Moving Parts
All moving parts must have guards to protect personnel.
Refer to local codes for requirements as to the number,
type and design. Fully secure fan wheel before
performing any maintenance. The fan wheel may start
“free wheeling” even if all electrical power has been
disconnected. Before the initial start-up or any restart,
check the following items to make sure that they are
installed and secure.
• Do not spin fan wheel faster than the maximum
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.
Guards – Motor Cover, Weatherhood
Do not operate fans without proper protective devices in
place. Failure to do so may result in serious bodily injury
and property damage. Check local codes to ensure
compliance for all protective devices.
General Information
System Set-Up
Installations with inlet or discharge configurations that
deviate from this manual may result in reduced fan
performance. Restricted or unstable flow at the fan inlet
can cause pre-rotation of incoming air or uneven loading
of the fan wheel, yielding
large system losses,
increased sound levels and
structural failure of the fan
wheel. Free turbulent flow
in the discharge ductwork
will also result in system
effect losses. Refer to the
following diagrams for the
most efficient installation
conditions.
Ducted Inlet Installations
Inlet Duct Turns
- Installation of a duct turn or elbow
too close to the fan inlet reduces fan performance
because air is loaded unevenly into the fan wheel. To
achieve full fan performance, there should be at least
three fan wheel diameters between the turn or elbow
and the fan inlet.
Inlet Spin
- Inlet spin is a frequent cause of reduced
fan performance. The change in fan performance is a
function of the intensity of spin and not easily defined.
The best solution is proper duct design and airflow
patterns. Turning vanes reduce the effects of inlet spin.
Rotat
io
n
R
ot
ati
on
R
ot
ati
on
Rotat
io
n
Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POOR
GOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
ST
ATIC PRESSURE LOS
S
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
5
10
15
20
25
30
35
40
45
FPM X 100
OUTLET VELOCITY
CUR
VE
1
CUR
VE
2
CUR
VE
3
CUR
VE 4
Rotat
io
n
R
ot
ati
on
R
ot
ati
on
Rotat
io
n
Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POOR
GOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
ST
ATIC PRESSURE LOS
S
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
5
10
15
20
25
30
35
40
45
FPM X 100
OUTLET VELOCITY
CUR
VE
1
CUR
VE
2
CUR
VE
3
CUR
VE 4
Rota
tio
n
R
ot
ati
on
R
ot
ati
on
Rota
tio
n
Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POOR
GOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
ST
A
TIC PRESSURE LOS
S
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
5
10
15
20
25
30
35
40
45
FPM X 100
OUTLET VELOCITY
CUR
VE
1
CUR
VE
2
CUR
VE
3
CUR
VE 4
TAG
MARK
S/N
MODEL
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