The latest board developed by Sitek Insulation, Batiboard 550+, is used for the construction of fire-resistant aeration and ventilation ducts. Self-supporting and cladding systems for steel ducts are targeted, horizontal and vertical, with circular or rectangular cross-section and for types A, B and C according to EN 1366-1 and -4 standards. The board has a very low dimensional deviation during the fire test, is very light and easy to install regardless of the configuration. The achieved performance is up to 240 minutes. The assembly is done either by screwing or clamping.