Abstract
Data will be presented showing the results of both laboratory tests and field experiences. The feasibility of using a terminal air delivery device to generate masking noise will be discussed. The information presented will be based on a large number of background noise measurements made in both older and newer buildings and on approximately 150 test subjects in the laboratory tests. The conclusions drawn are two-fold: (a) it has been found that the noise levels required to mask speech are lower than the average of the noise levels encountered in spaces where masking noise was not planned; and (b) to obtain the design masking noise level from air delivery devices requires more precise balancing of air flow than is normally done for temperature control reasons.
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