Well indoor climate means also: no static noise

In ventilation systems, noise stems from a variety of components such as the fans or the fire dampers. To comply with a specified noise level, sound attenuators are added to suitable locations in the ventilation system. The sound attenuators should have adequate silencing capabilities, low air resistance and be as small as possible.
With the introduction of VDI 6022, specific hygiene requirements for room air conditioning systems were required for the first time. Splitters and splitter attenuators from TROX are certified for use in room air conditioning systems in accordance with VDI 6022 Parts 1 and 3, DIN 1946 Parts 2 and 4 and VDI 3802.