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Ducted Outlet Installations
Discharge Duct Turns - Duct turns located near the
fan discharge should always be in the direction of the
fan rotation.
Fan performance is reduced when duct turns are
made immediately off the fan discharge.
To achieve cataloged fan performance
3/4 to
one fan
there should be at least
wheel
diameter
three equivalent
duct diameters of
straight ductwork
between the fan
discharge and
any duct turns.
diameter
Free Discharge - Free or abrupt discharge into a
plenum results in a reduction in fan performance. The
effect of discharge static regain is not realized.
SYSTEM EFFECT FACTORS CURVES
1.2
1.0
0.8
0.6
0.4
0.2
Three fan wheel diameters
0.0
0
5
GOOD
®
POOR
One fan
diameter
POOR
Length of Straight Duct
One fan
wheel
GOOD
10
15
20
25
30
FPM X 100
POOR
OUTLET VELOCITY
GOOD
Installation
Move the fan to the desired location. Check and tighten
fasteners throughout the unit and then fasten securely
through mounting holes provided in the base angles.
The unit must be set level (shimming may be necessary).
Flexible duct connections and vibration isolators should
be used where noise is a factor.
3/4 to
one fan
wheel
The motor voltage and ampere rating must be checked
diameter
for compatibility with the electrical supply prior to final
electrical connection. Supply wiring to the fan must
be properly fused, and conform to local and national
electrical codes.
When installing a fan, ensure the proper protective
devices are used to protect personnel from moving
parts and other hazards.
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 guards (motor cover and
weatherhood) and check the access doors to ensure
that they are installed and secure.
1.2
1.0
0.8
0.6
0.4
35
40
45
0.2
0.0
0
Turning
Vanes
POOR
CAUTION
POOR
Length of Straight Duct
GOOD
SYSTEM EFFECT FACTORS CURVES
5
10
15
20
25
30
FPM X 100
OUTLET VELOCITY
®
FumeJet
Fume Exhaust Fans
GOOD
35
40
45
5
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