When a fault occurs in an existing plant, Nießung can provide silencer equipment that can be retrofitted in the pre-existing system. They are characterised by their integral construction and low pressure loss.
In addition to resonator silencers, custom splitters can be created to dampen low-frequency sounds. That annoying 'humming noise' (such as an engine's ignition frequency or the sounds of combustion in a boiler) can be selectively reduced.