Keywords: Smoke exhaust duct2.jpg http //www ais-online de/6/pdcnewsitem/00/35/19/index_6 html Rad- und Schwimmsporthalle Berlin Smoke Exhaust Ductwork made of Calcium Silicate Fireproofing Boards Own 2007-02-27 Achim Hering Firestops Fireproofing DIN 4102 Calcium silicate Smoke exhaust ductwork Passive fire protection boards |