Sound transmission through ceilings from air terminal devices in the plenum

Authors

  • A.C.C. Warnock Natl Research Council Canada, Ottawa, Canada

Keywords:

Acoustic noise measurement, Acoustic wave transmission, Architectural acoustics, Attenuation, Building codes, Ceilings, Interiors (building), Mathematical models, Ceiling plenums, Room acoustics test (RAT) room

Abstract

HVAC sources in ceiling plenums are often major contributors to the noise level in occupied spaces below. A study was conducted to determine the sound attenuation through ceiling systems and the sound pressure levels in the room below. The focus of the study was on the interactions between terminal units, the ceiling panels, the plenum and the room below. The intent was to evaluate the calculation methods in ARI 885-90 and suggest improvements when necessary. Results showed that the difference between the sound power of a given device placed in the plenum and the average pressure level in the room below measures the combination of the plenum/ceiling effect and the average space effect.

Additional Files

Published

1998-09-01

How to Cite

1.
Warnock A. Sound transmission through ceilings from air terminal devices in the plenum. Canadian Acoustics [Internet]. 1998 Sep. 1 [cited 2025 Feb. 19];26(3):19-20. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1136

Issue

Vol. 26 No. 3 (1998)

Section

Proceedings of the Acoustics Week in Canada

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