The Tunnel du Frejus, under the mountains between France and Italy, is 13 km long. In the fire protection systems, Allia France installed huge smoke extractors (15 m long, 5 m high) which needed to be insulated to prevent the surface and the room to get too hot.
The shape of the extractors is far from even, as you can notice on the pictures, so Insulation installer Altrad Services used 1000 m2 of our Power-teK WM 620 GGN for this tailor-made covering, and they are very satisfied with the result.
The calculation optimization has been done with the calculation tool Exper-teK, to get the best insulation result with limited weight.