Nießing Anlagenbau

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Plate resonators

Smooth vibrating plates

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

The vibrating plates are insensitive to contamination and convert the sound energy into vibration energy. To absorb this vibration energy, special foams or mineral wool are placed between the statically supporting outer shell and the angular inner duct of the steel chimney.

Multifunctionality offers these advantages

  • Specific design for the low-frequency range is possible
  • Low flow losses – constant energy savings
  • Insensitive to fouling – cleaning is no longer necessary in most cases
  • Multifunctionality through integration into the chimney
  • Attenuation possible over the entire frequency range

The discharge of exhaust gases is restricted to a minimum discharge height specified by law. This is achieved with the Nießing chimney. To use the installation space for more than just the exhaust gas ducting, Nießing has developed the so-called “angular inner duct” in cooperation with the Fraunhofer Institute. This sound absorber changes the circular pipe into an acoustically effective polygon by means of flat, vibrating plates.

Multifunctionality made in Marbeck.


Silencers are subject to special conditions


Mineral wool production

There are two parallel operated plants with plate absorbers in operation at OWA, Amorbach, since 1996. The silencers used there are subject to extreme pollution conditions.


Painting lines

By installing slim plate resonators, the pressure loss was considerably reduced and the sound attenuation sustainably improved. As a result, the energy savings for two plants amounted to €610,000/year (as of 2010).



This is a silencer system for use in a textile manufacturing plant. Since a lot of wet fibers and saturated process air are transported through the silencer, it can quickly become dirty and lose its functionality.