2. Elevated Units;
Improper mounting of elevated blowers can cause vibration problems. The structure that the blower/motor assembly will
be mounted on must be strong enough to support at least 3 times the weight of the entire blower/motor assembly.
An
insufficient support will cause excessive vibration and lead to premature wheel and/or motor bearing failure
.
Bracing of the support structure must be sufficient enough to prevent any side sway. The entire structure should be weld-
ed at all connection joints to maintain constant alignment of the platform.
OMM-23-1009-page 4
THE IMPROPER DESIGN OF AN ELEVATED PLATFORM STRUCTURE COULD RESULT IN A RESONANT
CONDITION, AND CONSEQUENTLY, CAUSE A LIFE THREATENING, CATASTROPHIC, STRUCTURAL FAILURE.
C. Duct Work Connections:
All duct connections to the blower should include flexible connectors between the ducting and the blower inlet and/or dis-
charge. This will eliminate distortion, noise and vibration from transmitting to the duct and building. The connectors
should be selected to handle the operating conditions for air volume and pressure that the blower will produce.
All duct-
ing or accessories, added by the user, should be independently supported. DO NOT use the blower/motor
assembly to support any additional weight.
Inlet and/or discharge duct elbows should be located a minimum of 2
blower wheel diameters from the blower. Any duct elbows located closer than 2 wheel diameters to the blower inlet or
discharge
WILL
reduce the air performance and blower efficiency. Any duct elbows near the blower discharge should be
in the
same rotational direction
as the
blower rotation
.
Non-Ducted Blower Inlet:
Any blower with no ducting on the inlet
must
have an inlet guard. The blower should be located so the blower inlet is, at
least, 1 wheel diameter away from any wall or bulkhead to eliminate a reduction in air flow.
Non-Ducted Blower Discharge:
Any blower with no ducting on the discharge
must
have a discharge guard.
D. Safety Guards:
Cincinnati Fan offers guards, as optional, to keep your blower in compliance with OSHA safety regulations. These include
inlet or discharge guards. Any blowers built with high temperature construction, a “heat slinger guard” is standard. It is
the responsibility of the user to make sure this blower 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.
E. Dampers and Valves: (Airflow control devices)
If the blower is supplied with any type of air flow control device, it should be closed before initial start-up of the blower to
minimize 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.
Fig. 1
DANGER
