Noise measurements in buildings

Abstract

Acoustic design is an important consideration in mechanical services installations of all types and, with this in view, maximum noise levels in buildings are commonly specified by reference to either noise criterion (NC) or noise rating (NR) curves. Although these rating methods have existed for some years, confusion still arises from time to time regarding their use and appropriate measurement procedures. This Note is intended to assist engineers who are not primarily acousticians, but who are nevertheless charged with taking accurate and representative measurements to monitor and certify performance standards. The origin and applicability of rating indices are summarised and practical guidance given on field measurements.