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 to be ideal for tunnel fire protection, as well as easy and quick to install, was one of the compelling arguments," emphasizes Daniel Jäger, Head of Industrial Key Account Management at fischer Deutschland Vertriebs GmbH, who significantly accompanied the project. "The FNA II also meets the high requirements for wind suction loads and durability in the project and is additionally suitable for sensitive concrete as the anchoring base." Few installation steps were sufficient for execution: The fire protection board was simply positioned on the wall or ceiling, the drill hole was created through both, and then the anchor was set time-efficiently in through-fixing installation using a pneumatic setting tool. Under load, the FNA II expands independently. The cone is pulled into the expansion clip and clamps it against the drill hole. "The FNA II is very well suited 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 reliability."
