Tunnel-type rotary-drum tumble dryer

a, ba, ba, bA tunnel-type rotary drum tumble dryer includes a cabinet with a loading door and an unloading door on opposite sides, and a drum arranged inside the cabinet for rotating with respect to a horizontal or inclined geometric axis (E). The drum has a revolution wall around the axis (E), and end openings at opposite ends facing said loading and unloading doors. The tumble dryer also includes an air circulator that includes an air inlet facing one of the end openings of the drum and an air outlet adjacent to the other end opening of the drum for creating an axial flow of drying air inside and from one end to another of the drum through the clothing tumbling inside the drum.