* Test report, panel with insertion of mineral or stone wool tiles with black fleece facing
** Moist and/or corrosive environments, cf. grid system manufacturer recommendations
Sound absorption has been measured as defined in standard ISO 354. Data related to sound absorption (ap, aw, absorption class) has been calculated in compliance with standard ISO 11654 (LAUDESCHER LINEA + addition of acoustic materials).
LAUDESCHER LINEA ceiling 4.2.4 + 20 mm MW or SW on E250 mm plenum
Weighted index: aw = 0.75
Absorption class: Class C
According to ASTM C423: NRC = 0.85