Wheels must rotate freely and not rub on the inlet
venturi. Model SWB wheels overlap the inlet venturi as
shown in Figure 1. Refer to the SWB fan wheel overlap
and radial gap chart for proper dimensions.
Models SFD and SFB wheels do not overlap the
venturi, but have a gap between the inlet venturi
and the wheel (Fig. 2). Wheel position is preset at
the factory and the unit is test run. Wheel movement
may occur during shipment or installation and wheel
alignment may be necessary.
Installation of UL/cUL 762 Listed
Fans for Restaurant Exhaust
The UL/cUL 762 listing for restaurant exhaust is
available on Series 200 and 300 SWB fan model
sizes 206 - 224 and 327 - 349 with a weatherhood.
UL/cUL 762 fans are listed for a maximum operating
temperature of 375°F (191°C) and includes an access
door and 1inch (25.4 mm) drain connection. An
outlet guard is strongly recommended when the fan
discharge is accessible. An upblast discharge is
recommended. The fan discharge must be a minimum
of 40 inches (1016 mm) above the roof line and the
exhaust duct must be fully welded to a distance of
18inches (457mm) above the roof surface.
This drawing is for dimensional information only. See
the latest edition of NFPA 96 Standard for Ventilation
Control and Fire Protection of Commercial Cooking
Operations for detailed installation instructions,
materials, duct connections and clearances.
Model SFD or SFB
Alignment of Pulleys and Belts
Check pulleys and belts for proper alignment to avoid
unnecessary belt wear, noise, vibration and power
loss. Motor and drive shafts must be parallel and
pulleys in line as shown below.
The adjustable motor pulley is set at the factory for
the fan RPM specified by the customer. Fan RPM can
be increased by closing or decreased by opening the
adjustable motor pulley. Multigroove variable pitch
pulleys must be adjusted an equal number of turns
open or closed. Any increase in fan speed represents
a substantial increase in load on the motor.
To avoid motor overheating and possible burnout,
motor load amperes should always be checked and
compared to nameplate rating when fan speed is
Series 200 & 300 SWB models
are listed for grease removal
(UL/cUL 762) File no. MH11745.
Always disconnect power before working on or near
a fan. Lock and tag the disconnect switch or breaker
to prevent accidental power up.
When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
Precaution should be taken in explosive
Wrong Wrong Right
**Per NFPA 96 the fan discharge must
be a minimum of 40 in. (1016 mm)
above the roof surface.
*Per NFPA 96 the duct
must be of all-welded
construction to a
minimum distance of
18 inches (457 mm)
above the roof surface.
Centrifugal Utility Fans