The invention comprises a method for improving efficiency of uhle boxes in the process of paper manufacturing. The essence of the invention is the use of a homogeneous mixture of superheated humid air in the press section of a paper machine. A very intense mixing of air and steam takes place in venturi injector which creates a mixture, with appropriate composition and temperature, directed to a blowing nozzle. The mixture is then used in the forced flow through felt to a suction slot installed under the felt. The time ratio of the flow of homogeneous mixture of superheated humid air versus longitudinal movement of felt equals the actual working surface area of the suction slot. Extended working area directly influences the quality of felts conditioning and paper dewatering in the press section.