Angular interior stack as industrial silencer

Exhaust air and exhaust gases are closely linked to the height prescribed by the law for the chimney. The existing chimney length is predestined as a silencer in angular stack form. This new damping system makes use of the interior of the chimney (or the exhaust gas flue) not in a round shape, but – using flat panels able to vibrate – in an angled formation.
The acoustic planning and design is computerized with corresponding calculation programs. All designs are checked in an approval testing at the factory.

The vibrating panels are insensitive to dirt and they convert the sound energy into vibration energy. As an absorber there is special plastic or mineral wool inserted between the load-bearing outer shell and the angular stack inside the steel chimney. In this way, exhaust gas and exhaust air systems can be operated without using additional silencers.

This multi-functionality has the following advantages:

• low frequency highly efficient – wide-ranging emission protection
• low flow loss – continuously saving energy
• not sensitive to dirt – low maintenance costs
• integral design – substantial saving of space
• high level of prefabrication – installed speedily
• A broadband damping effect through a combination of different resonator chambers

Sound damping with awards

This new sound-damping system has received a number of awards

• Innovation prize Münsterland 1999
• Professor-Adlabert-Seifriz prize 2000
• Bavarian State prize 2001 for technology at the International Crafts Trade Fair Munich
• 3rd prize in the competition "Environmental protection prize for crafts in North-Rhine-Westphalia"

Picture above: fitting a honeycomb in the angular stack;
Picture below: certificates as recognition of the innovative sound-damping system