NBN ISO 20189:2021

This document specifies how screens, furniture and single objects intended for interior use are assessed
with regard to sound absorption and specifies the evaluation of sound attenuation for floor screens. It
also specifies under which circumstances various interior products for offices, schools and other public
spaces are considered as plane absorbers or as discrete single objects. A product considered as a single
object and intended for interior use is measured according to ISO 354 and evaluated by its equivalent
sound absorption area or object sound absorption coefficient in octave bands. This document defines
interior products and single objects and it comprises additional information regarding measurements
and assessment of single objects.
The sound absorption as specified in this document can be used to calculate:
a) reverberation time characteristics in rooms;
b) room acoustic parameters using ray tracing software.