Acoustic and numerical evaluation demonstrates broadband noise attenuation in a thin ventilation unit, highlighting viable fiber-free building soundproofing.
Natural ventilation is a key strategy in green buildings for reducing building energy consumption and improving indoor air quality. This study presents a compact, fiber-free soundproof natural-ventilation system incorporating thin micro-perforated panel (MPP) absorbers arranged within L-shaped cavity as an expandable unit. Multiple thin MPP layers enable broadband and tunable absorption, offering a practical alternative to porous and metamaterial-based designs. Under random-incidence excitation, the system achieves up to 25 dB transmission loss and maintains 15 dB attenuation from 700 Hz to 3 kHz, corresponding to STC 17–19. Compared with commercial liner systems, it provides superior low-frequency performance while being 40% thinner, thereby improving architectural compatibility. Computational Fluid Dynamics (CFD)-acoustics analysis further shows that airflow velocities below 2 m/s can be accommodated without compromising acoustic performance. Design parameters and configuration guidelines are provided to support practical implementation in building applications.
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Prasetiyo et al. (2026) studied this question.
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