Combined effect of acoustical screens and acoustic ceiling
This interaction is a central issue in International Standard ISO 17624:2004, Acoustics — Guidelines for noise control in offices and workrooms by means of acoustical screens. Besides silencers and enclosures (see ISO 14163 and ISO 15667, respectively), indoor screens are used as secondary means of noise control in workrooms and offices. Among others, it says “It is the effectiveness of these measures (sound absorbers), and the fittings of the room, which determine the amount by which the insertion sound pressure level difference of a screen in the room is less than the free-field screen sound attenuation”
