Acoustic Features:
Distance between grooves: 29 mm
Groove width: 3 mm
Groove depth: 6 mm
Distance between holes: 32×32 mm
Hole diameter: 8 mm, 6 mm, 4 mm
Hole depth: 15 mm
Open area: 6%
Hole count per sqm: 1000
Acoustic Value:
NRC: 0.55 Euro Class C