One-way sound insulation

Illustration of how installations in the void can give rise to noise. Installations in the void between the structural soffit and the suspended ceiling, such as piping and ductwork systems, can give rise to noise.

In such cases, a sound insulating suspended ceiling system can be used to reduce the noise to acceptable levels in the room below.

One-way sound insulation values

Laboratory value R_w according to ISO 140-3 and ISO 717-1

Product	Laboratory value R_w
Combison Duo A	32 dB
Combison Duo E	33 dB
Combison Uno A	27 dB
Combison Uno Ds	28 dB

In order to determine the noise level generated by a source in the void, you should ascertain the frequency spectra of the suspended ceiling's sound insulation and the noise source.