Diagnosis
Ventilation noise usually comes from too high a flow rate, undamped ducts or a poorly placed unit. With silencers, generous ducts and a demand-controlled system, ventilation runs almost inaudibly.
Take the ventilation check
Quiet ventilation
A humming fan, whistling grilles or draughts make ventilation annoying, while a good system is barely audible. The cause is usually the design: tight ducts, too high a flow rate or a unit too close to the living area.
How ventilation becomes quiet
Silencers on the ducts, generously sized ducting and a demand-controlled system that only ramps up when needed keep noise low.
Indoor air
What healthy indoor air means
Ventilation is about invisible air quality. Here is how to recognise healthy values.
CO2ppm
good: below 800attention: above 1200
High CO2 makes rooms stuffy and tiring, often in bedrooms.
Relative humidity%
good: 40 to 60
