How does perforation affect acoustic performance in façades?

Perforated aluminum façades enhance acoustic comfort by combining patterned metal skins with absorbent backing materials. The perforations—ranging from micro-holes to larger geometric shapes—allow sound waves to enter a hidden cavity where a mineral wool or acoustic foam liner dissipates energy through friction and air movement. Panel design—hole diameter, spacing, and open-area ratio—determines the frequency range best absorbed; higher open areas yield broader bandwidth performance. Behind the panel, an air gap further tunes the system’s resonance, attenuating low frequencies. This setup lowers reverberation within lobbies and corridors and reduces exterior noise intrusion in urban environments. By integrating custom-designed perforation patterns with high-quality absorbers, aluminum façade systems offer both striking aesthetics and measurable acoustic benefits in demanding architectural applications.