The tunnels designed for mushroom growing are characterized by a relatively light structure made of hot-dip galvanized round steel pipes, which are arched at the top and braced. This type of design has a positive effect on air circulation inside the growing rooms. The tunnels are insulated using minerall wool, reinforced with mineral fleece and covered with special tarps, designed for the mushroom industry. The tunnels are also adaptable to oyster (as well as exotics) mushroom growing. Depending on the selected length of the tunnel, it is possible to adjust the growing area as expected or needed by the Client. Tunnels can be adjusted in height for 4-6 level of growing shelving.