TOPPERFO-T 16/16 10-5 The successfully applied T-perforation, as developed by Topakustik, has a very soothing appearance and nevertheless a very profound acoustic absorption. The principal that is used here is of a small perforation at the front that has a bigger one behind it (which is perforated at the back). Due to its funnel-like shape Topperfo-T has an excellent absorption, despite of its tiny visible perforation holes. TOPPERFO-T 16/16 10-5 represents perforation holes in a grid of 16x16mm, with perforation holes of 5mm at the front and 10mm at the back. Surface finishing: available in every Ral/NSC color / (pre-treated) wood veneer / provided with HPL/CLP and in a wide range of melamine decors. Panels: Available as custom-made panels, for applications such as closet and sliding doors, partition walls and shutters. Fire retardant: Also available as FR with a MDF Euro fire class B-s2,d0 core.