Fan Noise - RITE-HITE REVOLUTION SP Installation And Owner's Manual

REVOLUTION SP FAN

FAN NOISE

Revolution Fans are engineered to utilize the full output of a 1 HP motor. So while they are quiet,
they do generate noise. The noise can be characterized in these ways:
1. Low pitched "rumbling" noise is commonly
from the gearcase. It will change pitch as
the fan increases in speed. Once the fan
reaches a set speed, the rumbling noise
should turn to white noise and blend into
its environment. The typical operating
range for a fan at full speed is 40-44 dbA.
2. High pitched noise is typically electrical
noise. This is the noise that many people
will detect. It is caused by the frequency
drive creating power for the fan motor, and
it will always be present with a motor that
is controlled by a variable-frequency drive.
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3. Wind noise will be present because the fan
is moving a high volume of air. This will be
more evident if there are obstructions to
the air flow.
4. The attachment hardware sometimes
causes vibration noise. Take the
necessary steps to identify and eliminate
the vibration
Pub. No. RFSP Rev. 5 - December 2010