A silencer is a device which reduces the noise created by a sound source through the partial absorption of the noise.
In an installation, the ventilator, as a moving part, often acts as a source in the generation of noise. The passage of air at high speeds (in narrow channels or in leaks) also creates noise. Metallic tubes amplify this noise and generate sound where vibrations are caused on their surface. In the case of pneumatic transport the impact caused by solid particles transported in the tubing is also the origin of sound. Noise is a health risk for all workers.
On occasions we use silencer sections in tubes in order to reduce this noise. This normally involves perforated tubes covered with an absorbent material and protected externally with a second layer of sheet metal.