Abstract
We were faced with the need to develop a noise analysis for replacement rooftop units at a university academic building. With uncertainty about the accuracy of as-built documentation for some of the distribution ductwork and existing duct silencer performance, there was concern that a traditional hand calculation of sound levels from the new rooftop air handling units may not be a reliable method of evaluation. We developed a test method to document in-situ sound power levels from the existing units and resulting sound pressure levels in interior spaces using a reference sound source. These data were then used to predict interior sound pressure levels from the new units. This paper presents the test method, results, and lessons learned.
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