The attenuator casing is made of galvanized steel sheet. There are splitters located inside the casing, consisting of frame made of galvanized steel sheet and infill made of noncombustible, sound absorbing material (class A1 according to DIN 4102) The surface of the absorbing infill is additionally covered with glass fibre fabric resistant to abrasion. Normally TAP are equipped with flange connections with width of 20, 30 or 40 mm. (depending on the attenuator cross-section). Making the custom sound attenuator with non-typical dimensions is possible on special request. These attenuators are marked with symbol TAPS. In stainless steel version the above mentioned components are made of stainless steel 1.4301 (according to PN-EN 10027-2).