The effect of changes in the configuration of a slatted ceiling on reverberation and clarity in a room

Abstract

In architectural design, slat structures such as louvers or panels are extensively employed as finishing systems in both interior and exterior applications. Recently, their use in spaces where acoustics are important has significantly increased, broadening their functional scope. However, notable research gaps exist in evaluating the effects of slat structures on room acoustics, highlighting the need for fundamental data to support their multifunctional applications. This study investigated the effects of horizontally installed slat structures across the entire ceiling area of rooms using scale-model experiments. A 1/15 scale rectangular room was utilized, examining design variables such as the presence of slat structures, upper volume, installation height, slat width, distance, and angle. The effects on reverberation (T₃₀ and EDT) and clarity (C₅₀ and C₈₀) in the room below the slats were systematically measured and analyzed. Generally, installing slat structures shortens the room’s reverberation and increases clarity compared to conditions without slats. By increasing the upper volume, lowering the installation height of the slat structures, and using wider slat width and distance, significant differences in reverberation and clarity can be achieved. In addition, the slat angle should be oriented in a clockwise or counterclockwise direction rather than at 0° to enhance reverberation, clarity, and spatial distribution.