A measure for rating the speech privacy performance of a ceiling in an open plan environment where sound is reflected off the ceiling between two adjacent spaces divided by partial-height furniture panels.
- A ceiling system with Articulation Class < 150 is low performance.
- A ceiling system with Articulation Class > 200 is high performance.
A high Articulation Class gives some speech privacy; a lower AC value means lower privacy. American acoustic consultants usually refer to suspended ceiling systems with minimum AC 180 in order to achieve some kind of acceptable speech privacy for normal working tasks.
ASTM E 1110 Standard specification for the determination of Articulation Class
ASTM E 1130 Standard test method for objective measurement of Speech Privacy in open offices using the Articulation Index
Subjects: Noise & Vibration