Why do heat recovery units make noise?
Even the quietest units generate sound. Fan rotation and airflow movement through ducts create vibrations and aerodynamic noise. Without proper insulation, this sound travels through metal pipes like a telephone wire – straight into your bedroom or living room.
Constant background hum is exhausting. Although you might not notice it during the day, at night even 30 dB(A) noise (equivalent to a whisper) can disturb deep sleep. A common mistake is investing in an expensive unit but skimping on silencers, which forces you to run the system only at minimum speed later.
How do acoustic silencers work?
A silencer acts like a sound sponge. Inside, mineral wool covered with perforated metal or fabric absorbs sound waves while allowing air to flow freely. The result – fresh air enters the rooms, but the noise stays trapped inside the silencer.
A properly designed system is almost silent. By using rigid or flexible silencers, you can reach a level where you only know the ventilation is on by checking the control panel.
Reduces noise by up to 25 dB(A) – this means your ventilation system will run quieter than a running fridge or a library.