Utility and Centrifugal Fans
12
®
Installation of UL/cUL 762 Listed
Fans for Restaurant Exhaust
The UL/cUL 762 listing for restaurant exhaust is
available on the USF-300 and 400 and CSW.
UL/cUL 762 fans are listed for a maximum operating
temperature of 400°F
(204°C)
and includes an access
door and 1 inch
(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
18 inches
(457 mm)
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.
40 in.**
(1016 mm)
18 in.*
(457 mm)
Duct
from
kitchen
hood
Upblast Discharge
Optional Companion
Flange
3 Wheel
Diameters
Weatherhood
**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.
USF-300, 400 and CSW models are
listed for grease removal (UL/cUL 762)
File no. MH11745
IMPORTANT
When installing a fan, ensure the proper protective
devices are used to protect personnel from
moving parts and other hazards. A complete line
of protective accessories are available from the
manufacturer including: inlet guards, outlet guards,
belt guards, shaft guards, protective cages and
electrical disconnects.
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 (belt, shaft,
inlet and outlet) and check the access doors to
ensure that they are installed and secure.
Bases (Foundation and Isolation)
Critical to every fan installation is a strong, level
foundation. A reinforced poured concrete pad with
a steel base or inertia base provides an excellent
foundation. Bases must be sturdy enough, with
welded construction, to prevent flexing and vibration.
To eliminate vibration and noise from being
transferred to the building, vibration isolators should
be used. The fan is mounted directly on the isolation
base and must be supported for the entire length
of the fan base angle. (Refer to the Centrifugal Fan
Isolation Base Assembly Instructions if the base was
supplied by manufacturer). Isolators are installed
between the isolation base and the foundation.
After the fan, isolation base,
and isolators are installed,
the entire assembly must be
leveled. Position the level
on the isolation base, not
the fan shaft, for proper
leveling. Additionally,
the motor and fan
shafts must be
level and parallel
relative to each
other for proper
alignment.
Typical Fan on Isolation Base
Electrical Connections
Before electrical connections are made, the supply
voltage, phase and ampere capacity must be checked
for compatibility with the fan motor. In addition, the
supply wiring must be properly fused and conform
to local and national electrical codes. If the unit is
supplied with a safety disconnect switch, ensure
proper wiring to the fan motor. Be sure the disconnect
is switched to the “OFF” position before connecting
supply wires. If no disconnect is supplied, ensure the
supply wire is not live before connection. Supply wires
are then connected to the optional safety disconnect
switch (if supplied) or motor.