Acoustic Features:
Distance between grooves: 5 mm
Groove width: 3 mm
Groove depth: 6 mm
Distance between holes: 16×8 mm diagonal
Hole diameter: 8 mm, 6 mm, 4 mm
Hole depth: 15 mm
Open area: 40%
Hole count per sqm: 8000
Acoustic Value:
NRC: 1.0 Euro Class A