A unit for thermosetting printed fabrics, comprising: a heated roller rotatable about a rotation axis and having a cylindrical outer surface, at least one fabric guiding element having an inner wall facing the cylindrical outer surface of the heated roller and defining a gap with the cylindrical outer surface of the heated roller for passing the fabric, wherein said at least one fabric guiding element has a fume suction chamber connected to a suction device, and wherein said inner wall has a plurality of holes communicating with said suction chamber.