FIREPROOF® fire protection ventilation ducts L90
Ventilation ducts of fire resistance class L 90 according to DIN 4102-6: 1977-09 made of calcium silicate boards "PROMATEC-LS"
corresponding Current No. 2.4 Building Regulations List A Part 3 - Edition 2015/2
Construction product for the installation of ventilation ducts, which have to meet fire resistance requirements.