Filter device, air conducting hose with filter element, tunnel, and use of the filter device

A filter device for ambient air filtration, the filter device comprising:

• a blower housing comprising an air inlet and an air outlet;
• a device configured to generate an air flow arranged in the blower housing, wherein the device configured to generate an air flow generates an air flow from the air inlet to the air outlet in operation;
• a flexible air conducting hose comprising a first open end configured to be connected to the air outlet of the blower housing and further comprising a second closed end;
• wherein the flexible air conducting hose comprises one or more openings arranged between the first open end and the second closed end;
• one or more filter elements, each filter element arranged in one of the openings, respectively, and separating a first side inside the flexible air conducting hose from a second side downstream of the filter element;
• wherein the flexible air conducting hose is configured to be inflated by the air flow generated in operation of the device configured to generate an air flow;
• wherein the flexible air conducting hose comprises a reduced air permeability in comparison to an air permeability of the filter elements, and
• wherein the flexible air conducting hose comprises a flow guiding structure arranged in an interior of the flexible air conducting hose.