Nießing Anlagenbau

Startseite / Products / Exhaust silencer
Exhaust silencers

Whatever comes to your attention

Nießing offers silencers that both effectively dampen over the relevant frequency range and are adapted to the space requirements with optimized construction volumes.

Operators of power plants are required to comply with relevant environmental regulations, for example noise levels. Nießing treats the exhaust system – from the outlet of the power generator (boiler, engine, …) to the chimney orifice – as a complex unit during acoustic testing.

To reduce the noise levels, sound attenuation measures are implemented, mainly in the exhaust gas carrying system. In order to eliminate the problematic, low-frequency components, as well as to meet the medium- and high-frequency requirements, a combination of different silencers is often required.

Nießing has silencers in its portfolio that both attenuate noise effectively over the relevant frequency range, while only requiring little space due to optimized construction volume. Low-frequency noise can be attenuated with little pressure loss because the silencers operate without inserts. Individual silencer geometries are available for every requirement. The acoustic acceptance measurement of the Nießing silencers is carried out in the company’s own test facility.

Combination silencer

Attenuation from 25 – 8000 Hz

Nießing combination silencers provide high attenuation over the entire frequency range – with almost no pressure loss during the operation.

Combination silencers usually operate without inserts, in order to exploit all the benefits in terms of minimal pressure loss. The combination of the hollow chamber resonator designed over a wide frequency range with a porous absorber, allows for attenuation over the entire spectrum from 25 Hz – 8000 Hz.

Nießing silencer systems can be integrated not only into pipelines but also into steel chimneys, and can also be designed and installed directly as a self-supporting steel chimney variant.


Diverse customized solutions

Baffle silencer

The baffle silencer uses the principle of the reflective silencer. It works over a broad band, and also particularly at low frequencies.

Hollow chamber resonators

Hollow chamber resonator pipe silencers are fully welded stainless-steel assemblies that provide high attenuation with virtually no pressure drop, as these systems operate without additional inserts in the exhaust gas stream.

Plate resonators

Exhaust air or exhaust gases are strictly linked to the chimney height stipulated by law. The existing chimney length is ideal for the “angular inner flue” as an industrial silencer. This attenuation system uses the inner duct of the chimney (or exhaust pipe) not in a circle, but – via smooth vibrating plates (plate resonators) – in an angular design.


In case of complaints in existing plants, Nießing offers silencer solutions which can also be retrofitted into existing plants. They feature an integral design and low loss in pressure.