Aerodynamic 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 gains in efficiency and reduced energy use.