Ultimately, the system was tested in several fire trials to comprehensively ensure its suitability. The fischer nail anchor FNA II A4 was used, with more than 1.7 million units installed. "The fact that our FNA II A4 has been proven ideal for tunnel fire protection, as well as being easy and quick to install, was one of the strong arguments," emphasizes Daniel Jäger, Head of Industrial Key Account Management at fischer Deutschland Vertriebs GmbH, who was significantly involved in the project. "The FNA II also meets the high requirements for wind-suction loads and durability in the project and is also suitable for the sensitive concrete as the anchoring base." Few assembly steps were needed for execution: The fire protection board was simply positioned on the wall or ceiling, the drill hole was made through both, and then the anchor was set time-saving in the through-mounting using a pneumatic setting tool. Under load, the FNA II expands independently. The cone is pulled into the expansion clip, clamping it against the drill hole. "The FNA II is very suitable for this application because it is very easy to process. Simply drill the hole, drive in the nail anchor – and done! Once set, it guarantees its function for a very long time," confirms Sven Burgard and emphasizes: "Collaboration on a project of this size is crucial for a positive outcome. Once again, fischer has proven itself as a reliable partner in terms of quality, punctuality, and dependability."
