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A study was conducted to measure background noise levels and to predict reverberation times in university classrooms. Twenty-five classrooms were selected due to the dimensions and location. Background noise level in all classrooms exceeds the recommendations in ANSI S12.60-2002. Calculated reverberation times based on the Sabine equation indicate that none of the classrooms have reverberation times below the recommendations in ANSI S12.60-2002, as well as the Building Bulletin 93. It is concluded that interior noise sources, such as classrooms’ HVACs, students from other classrooms or corridors, and corridors’ HVACs, must be taken into consideration rather than exterior noise sources because all eight buildings were located far from any environmental noise sources. The classrooms’ doors (due to the openings) are more responsible for sound transmission than are the walls.

Technical Note: Measurement of Background Noise Level and Prediction of Reverberation Time in University Classrooms