Air extraction system for active combating of fire in traffic tunnel creates oppositely-directed airflows from both directions after outbreak of fire and directs these to source of fire or smoke at calculated speed

摘要

The air extraction system for the active combating of a fire in a traffic tunnel (1) creates oppositely-directed airflows (2) from both directions after outbreak of a fire and directs these to the source of fire or smoke at a calculated speed. This air is discharged outwards directly above the said source through an extraction opening (4) of the air extraction system (6a,6b), creating a suction funnel (5) over the entire cross section of the tunnel, including the fire or smoke source. Consequently, smoke is not distributed in the tunnel and the fire cannot develop.