Universal Single Width Fans
6
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 and increased sound levels. Free discharge or 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.
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.
The motor voltage and ampere rating must be checked 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.
The discharge is factory set as specified by customer
order, however, certain sizes can be rotated to other
discharge positions in the field, if necessary. If rotating
the fan housing, accommodations may need to be
made for the fan to drain properly.
Series 100
- Rotatable housings are standard.
Removal of the housing bolts, inlet cone and wheel
allows the discharge to be rotated to the clockwise
positions shown above. For models with EC motors,
the motor nuts on the inside of the scroll will also
need to be removed. Fan rotation is always specified
from the drive side of the housing.
Series 300
- Rotatable housings are standard on
sizes 49 and less. Removal of the housing bolts, inlet
cone and wheel allows the discharge to be rotated to
the positions shown to the left. Fan rotation is always
specified from the drive side of the housing.
Series 500
- Rotatable housings are standard on
sizes 30 and less, arrangements 1, 9 and 10, and
class 0, I and II. Sizes 33-73, as well as fan classes III
and IV are not field rotatable. Removal of the housing
bolts, inlet cone and wheel allows the discharge to
be rotated to the positions shown to the left. For
downblast (DB) discharge position, a portion of the
frame angle must be removed. Fan rotation is always
specified from the drive side of the housing.
Series 300
Series 500
CW BH
CCW BH
CW BAU
CCW BAU
CW UB
CCW UB
CCW TH
CW TH
CW DB
CCW DB
CW TAU
CCW TAU
CW BH
CCW BH
CW BAU
CCW BAU
CW UB
CCW UB
CCW TH
CW TH
CW TAU
CCW TAU
XUEF-300 and XUEF-400
CW BH
CCW BH
CW BAU
CCW BAU
CW UB
CCW UB
CCW TH
CW TH
CW TAU
CCW TAU
VUSF-300 and VUSF-400
VCSW
CW BH
CCW BH
CW BAU
CCW BAU
CW UB
CCW UB
CCW TH
CW TH
CW DB
CCW DB
CW TAU
CCW TAU
CW BH
CCW BH
CW BAU
CCW BAU
CW UB
CCW UB
CCW TH
CW TH
CW TAU
CCW TAU
Series 100
CW UB
CW TH
VUSFD-100 and VUSF-100
CW UB
CW TH
XUEFD-100 and XUEF-100
CW UB
CW TH
Discharge Positions
Installation
NOTE
Existing holes will need to be plugged with self-threading fasteners.
Some field housing rotations will require drilling into the fan housing.
All grease fan applications will require the relocation of access door and drain connection.
Trim balance is recommended on the XUEF series 500.
Rotat
io
n
R
ot
ati
on
R
ot
ati
on
Rotat
io
n
POOR
POOR
GOOD
POOR
GOOD
Three fan wheel diameters
GOOD
Three fan wheel diameters
3/4 to one
fan
inlet
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 LOSS
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
CU
RVE
2
CUR
VE
3
CUR
VE 4
3/4 to one
fan
inlet
diameter
Rotat
io
n
R
ot
ati
on
R
ot
ati
on
Rotat
io
n
POOR
POOR
GOOD
POOR
GOOD
Three fan wheel diameters
GOOD
Three fan wheel diameters
3/4 to one
fan
inlet
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 LOSS
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
CU
RVE
2
CUR
VE
3
CUR
VE 4
3/4 to one
fan
inlet
diameter
