14.3 kilometers with Turkey's longest, after the world's 3rd longest double-tube highway tunnel Ovit Tunnel, which, in the Rize-linked tunnels İkizdere also Airone tunnel fans were preferred. The project has an investment volume of 650 million pounds. For the Rize-İkizdere stage of the project, Aironn produced 66 tunnel fans, each of which was tested in the Test Laboratory, which was certified by TÜV SÜD, and was completed in accordance with AMCA standards.
