Good acoustics, meaning less stress due to noise, is of major importance not only in offices, homes and public buildings. For air conditioning in buildings, however, it is not only acoustically hard materials that contribute to poor and echoey room acoustics; non-optimised ventilation components also have a detrimental effect. In practice it is thus frequently the case that during planning of ventilation systems a noise increase resulting from the installation situation of the ventilation components is not taken into account.