The use of flexible connectors on the inlet and outlet of the fan will make it possible to mount this fan in a duct system
and isolate any fan/motor vibration from the duct work. If flexible connectors will be used, the fan should be equipped
with horizontal or vertical support clips. Threaded rod should be used to connect the support clips to the building struc-
ture. Each rod should be strong enough to support two (2) times the weight of the entire fan/motor assembly. Spring
hangers would be needed on the rods to isolate any fan vibration from the building.
The connectors should be selected to handle the operating conditions for air volume and pressure that the fan will pro-
duce.
All ducting or accessories, added by the user, should be independently supported. DO NOT use the
fan/motor assembly to support any additional weight.
Inlet and/or discharge duct elbows should be located a mini-
mum of 3 fan diameters from the fan. Any duct elbows located closer than 3 wheel diameters to the fan inlet or discharge
WILL
reduce the air performance and fan efficiency.
Non-Ducted Fan Inlet:
Any fan with no ducting on the inlet
must
have an inlet guard. The fan should be located so the inlet is, at least, 3 fan
diameters away from any wall or bulkhead to eliminate a reduction in air flow.
Non-Ducted Fan Discharge:
Any fan with no ducting on the discharge
must
have a discharge guard.
2. On Machinery
If this fan will be mounted on machinery, the surface it will be mounted to must be strong and rigid enough to support the
weight of the entire fan without flexing, bowing, bending or oil-canning and thus causing vibration. Companion rings are
available that will match the flanges on the
DDF
fan. To minimize any leakage, it is recommended that some type of
caulking be used between the fan flange and the machine.
C. Safety Guards:
Cincinnati Fan offers guards, as optional, to keep your fan in compliance with OSHA safety regulations. These include
inlet or discharge guards. It is the responsibility of the user to make sure this fan meets all local, state and OSHA safety
regulations. If you have a specific guard requirement not covered by OSHA, please contact the local Cincinnati Fan sales
office for assistance.
D. Dampers and Shutters: (Airflow control devices)
If the fan is supplied with any type of air flow control device, it should be closed before initial start-up of the fan to mini-
mize overloading of the motor. Any airflow control device, with bearings, should be maintained in accordance with the
manufacturers instructions. Any air flow control device, with an automatic control mechanism, should be adjusted per the
manufacturers recommendations. Automatic shutters are opened and closed by the airflow from the fan.
E. Set Screw and Taper-lock Bushing Torque Values:
All propeller set screws are tightened to the proper torque prior to shipment. Some props may have taper-lock hubs and
split, taper-lock bushings to secure the prop to the motor shaft.
NOTE:
Check all set screw or taper-lock bushing torques. Forces encountered during shipment, handling, rigging and
temperature can affect factory settings. For correct torque values, see
Tables 1
and
2
below.
OMM-14-0509-page 4
DANGER
SET SCREW TORQUE VALUES
TORQUE VALUES FOR
TAPER-LOCK BUSHINGS
Diameter & Number
of Treads/Inch
Hex Wrence Size
(Across Flats)
Required Torque
(Inch Pounds)
1/4-20
5/16-18
3/8-16
7/16-14
1/2-13
5/8-11
1/8”
5/32”
3/16”
7/32”
1/4”
5/16”
65
165
228
348
504
1104
Taper-lock
Bushing Size
Required Torque
(Inch Pounds)
H
B
P
Q
R
95
192
192
350
350
Table 2
Table 1
