In response to the Communication pursuant to Art. 94 EPC 1.- A tunnel-type rotary drum tumble dryer comprising: a cabinet having opposite lateral walls (1a, 1b), with a loading opening having a loading door being formed in one of said opposite lateral walls (1a, 1b) and with an unloading opening having an unloading door being formed in the other of the opposite lateral walls (1a, 1b); a drum for containing clothing to be dried arranged inside said cabinet for rotating with respect to a horizontal or inclined geometric axis, said drum having a revolution wall around said geometric axis, and end openings (5a, 5b) at opposite ends of the drum facing said loading and unloading doors (2, 3); driving means for rotating the drum; and air circulation means for introducing and extracting drying air into/from the drum while the latter rotates with clothing therein; wherein said air circulation means comprise at least one air inlet facing one of said end openings (5a, 5b) of the drum and in communication with the inside thereof, and at least one air outlet facing the other end opening (5a, 5b) of the drum and in communication with the inside thereof for creating a flow of drying air inside the drum in the axial direction thereof substantially from one end to another through the clothing tumbling inside the drum, characterized in that said air outlet comprises an opening formed in one of the lateral walls of the cabinet below the loading door and facing the corresponding end opening of the drum, and the air inlet comprises an opening formed in the unloading door of the cabinet and in a position selected to be facing the corresponding end opening of the drum when the unloading door is closed. a cabinet having opposite lateral walls (1a, 1b), with a loading opening having a loading door being formed in one of said opposite lateral walls (1a, 1b) and with an unloading opening having an unloading door being formed in the other of the opposite lateral walls (1a, 1b); a drum for containing clothing to be dried arranged inside said cabinet for rotating with respect to a horizontal or inclined geometric axis, said drum having a revolution wall around said geometric axis, and end openings (5a, 5b) at opposite ends of the drum facing said loading and unloading doors (2, 3); driving means for rotating the drum; and air circulation means for introducing and extracting drying air into/from the drum while the latter rotates with clothing therein; wherein said air circulation means comprise at least one air inlet facing one of said end openings (5a, 5b) of the drum and in communication with the inside thereof, and at least one air outlet facing the other end opening (5a, 5b) of the drum and in communication with the inside thereof for creating a flow of drying air inside the drum in the axial direction thereof substantially from one end to another through the clothing tumbling inside the drum, characterized in that said air outlet comprises an opening formed in one of the lateral walls of the cabinet below the loading door and facing the corresponding end opening of the drum, and the air inlet comprises an opening formed in the unloading door of the cabinet and in a position selected to be facing the corresponding end opening of the drum when the unloading door is closed.