PERFOSOUND LINE Type 293: sound-absorbing planks/panels with repeating groove-patterns. Type 293 represents a wider dam of 29mm and a groove of 3mm. The PERFOSOUND LINE creates acoustic absorption through grooves in the surface and underlying perforations, together with mineral wool in the back structure, possibly also with a cavity. Surface Finishing: Available in all Ral/Ncs colors / (pre-treated) wood veneer / provided with HPL or in a wide range of melamine MDF decors. Planks: When the planks are mounted together they create a continuous pattern. Panels: Available as custom-made panels, for different applications such as closet and sliding doors, partition walls and shutters. Fire retardant: Also available in FR with a MDF Euro fire class B-s2,d0 core.