Abstract: The invention relates to a method and a device for extracting fumes and heat and for providing operational ventilation for traffic structures and enclosed traffic spaces. The inventive system for drawing off fumes and heat and for providing operational ventilation for traffic structures and enclosed traffic spaces does not use any pipe ventilators for extracting the fumes and builds up a vacuum throughout a duct in order to extract the fumes. The system is characterized in that a number of reversible jet ventilators are provided inside a modular smoke extraction duct situated preferably beneath the tunnel ceiling or the ceiling of an enclosed space. The jet ventilators are evenly distributed over the length of the duct and the duct itself has evenly distributed openings. The jet ventilators are able to rapidly accelerate the air or the fumes of a fire on the road in a particular direction in the duct by virtue of an impulse effect.