Type 12/4 provides very efficient sound absorption in the low frequencies. Groove distance is 4mm in front of the panel, and the distance between each groove is 12mm. There are 4000 holes/m² at the back of this model, the diameter of each hole is Ø10mm. The Noise Reduction Coefficient of 0.89 is especially recommended on ceilings.
Like most SIUAKUSTIK® PLANKS, Type 12/4 can be installed by stapling to a timber batten or clamping to a Omega profile with clips.