Fan noise control

When an extract system fan
drone at Red Bull
Technology created a
potential environmental
noise problem, the company
turned to aerodynamic noise
control technology
developed for fans by the
Industrial Noise and
Vibration Centre.

The aerodynamic inserts
were designed, manufactured
and installed inside the fan
casing in a short time frame.

The effect was dramatic: the 218Hz
low frequency tone was reduced by a
factor of around 1000 (said to be a
new record for the technique),
completely eliminating the
problem at source for the
lifetime of the fan, without
maintenance and without
affecting fan efficiency.

This fan noise control
technique is said to be faster
to fit and substantially lower
cost than traditional
silencing; it is usually selffinancing
due to the gains in
efficiency and reduced
energy use compared with
conventional silencing.