Ventilating acoustic barriers made of open metasurfaces have exceptional properties that can be used to simultaneously block sound while allowing passage of air. However, most of them have been small and designed to operate in a one-dimensional wave field with a normally incident plane wave. In this work, we present a full-sized acoustic barrier based on a light-weight metasurface with internal helical sound paths. It has high transmission losses at low frequencies, allows flow-through of air for ventilation, and works in a broadband diffuse field. The effectiveness of the design is confirmed by simulations and experiments in reverberant environment. The barriers are thin (about λ/11 of the lower onset frequency) and offer sound transmission losses consistently higher than 10 dB from 610 to 1120 Hz in a diffuse field while retaining a ventilation fraction of 20%. This design has good potential for applications requiring a combination of ventilation and soundproofing, such as in green buildings.

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