Two existing exhaust air systems had to be retrofitten with silencers due to complaints from the surrounding areas. There was no space for this inside the heating plant and the pressure loss had to be minimal. The most economical solution was to retrofit resonator splitters into the existing steel chimneys. The goal was to eliminate sounds with a frequency off 100-140 Hz.
Unit: 2 x 2.9 MW Boiler (operating temperature 150°C)