Perforated Panel

A perforated panel is a rigid sheet (metal, wood, plasterboard, or MDF) with regularly spaced holes that acts as an acoustic absorber when mounted over a porous absorber or air cavity. The perforations allow sound to pass through to the absorptive backing while the panel provides a durable, cleanable finish. The open area percentage (typically 8–25%), hole diameter, panel thickness, and cavity depth determine the absorption characteristics. Low open areas create a Helmholtz resonator effect with tuned absorption; high open areas make the panel effectively transparent to sound. Perforated metal ceilings and wall linings are common in airports, shopping centres, corridors, and industrial spaces where durability and hygiene are priorities. Performance is tested per ISO 354 with the specific backing and cavity depth specified. Perforated panels are often combined with a fleece backing to prevent fiber migration.