Perforated facing | Article about perforated facing by The Free Dictionary
In an acoustical assembly, any flexible or rigid perforated sheet or board designed as a protective surface allowing free access of sound to an underlying layer of sound-absorptive material.
References in periodicals archive
Adding an air cavity between the porous absorber and the perforated facing decreases the absorption (fig.
Absorption Characteristics of Acoustic Material with Perforated Facings.