The project Förbifart Stockholm is a bypass-link connecting the E4 highway north of Stockholm to the same highway south of Stockholm. A total of 21 km of highway will be built of which 18 km trough tunnels. The dual tunnels together with 6 adits, ramps will require more than 45 km of tunnels.
SWEDFAN designed the construction ventilation for two of the major lots which will be built by Subterra and a JV of CMC/Vianini and SWEDFAN signed the contract to supply the complete ventilation system for those two contracts.
13 larger fan stations, each up to 355 kW and 24.000 m of ducting, mainly 2,0 2,4 and 2,6 m in diameter is included in the scope of supply.