Special silencer for extraction fan noise nuisance
On some types of fan, the noise causing the nuisance is not primarily
a drone, hum or whine, and a noise reduction is needed over a wide
range of noise frequencies. In such cases, the advanced noise cancelling
technique described in the "cancelling fan noise" example
may not be the best option.
Sometimes, an "off the shelf" silencer is not suitable
because it does not provide sufficient noise reduction or because
it would impose too high a pressure loss, causing an unacceptable
loss of fan performance, suction or extraction.
In such cases, we have purpose-designed a special type of silencer.
We design this type of silencer in such a way as to provide a very
high noise reduction combined with a very low (negligible) pressure
loss, i.e. very low resistance to airflow. So, there is little or
no loss of suction, extraction or airflow rate.
This type of silencer has been very successful on many different
types of fan installation. We design the silencer according to the
noise reduction needed. A noise reduction of 15 - 17 dBA is
typical for this type of silencer, but in some cases has been as
high as 25 dB. Where a lower noise reduction is needed, we design
a smaller silencer. This minimises the cost. With a smaller, lower
cost silencer, the typical noise reduction is in the region of 8
- 10 dBA.
There are some more industrial fan noise control examples on the Industrial Noise Control - Noise
Nuisance and Industrial Noise Control
- Noise at Work pages of this web site. Although these
focus on an industrial silencer, the purpose-designed type of silencer
can be used on any type of fan or in any environment, not just industrial
To find out how we can help you by purpose-designing a silencer
or with other types of solution to a fan noise nuisance problem,
or to receive our company brochure or a quotation, please click on contact us about an industrial silencer.
Advanced Noise Solutions Ltd
could help you save £ thousands on noise