A device for the flow-through treatment of web-shaped, gas permeable material, in particular for drying woven or non-woven fabrics, with the following features: - a sieve drum (S) that is rotatably supported and is connected with a vacuum generator, the sieve drum having a permeable outer circumference and a working width, wherein the material web (M) to be treated travels around a part of the outer circumference of the sieve drum (S), - a treatment chamber (BH) accommodating the sieve drum (S), which chamber is exposed to the gas to be treated, preferably heated air, - within the treatment chamber (BH), a sieve cover (SD) or corresponding flow guide elements are provided surrounding the sieve drum (S) in the area wrapped by the material web (M), by which the gas flowing in the treatment chamber (BH) is directed towards the sieve drum surface, wherein the wall (W) of the treatment chamber (BH), which faces the outer circumference of the sieve drum (S) in the area of wrapping by the material web (M), has, in this area, a decreasing distance to the surface of the sieve drum (S), characterized in that the gas can be supplied to the treatment chamber (BH) at the bottom side thereof via a supply chamber (Z) having a wedge-like sloping top and via a deflection chamber (U) adjoining the supply chamber below the same, wherein the supply chamber (Z) with the deflection chamber (U) is arranged in that region of the treatment chamber (BH) in which the wall is at the greatest distance from the surface of the sieve drum, wherein the supply chamber (Z), the deflection chamber (U), as well as the treatment chamber (BH) have the same working width that corresponds to the working width of the sieve drum (S). - a sieve drum (S) that is rotatably supported and is connected with a vacuum generator, the sieve drum having a permeable outer circumference and a working width, wherein the material web (M) to be treated travels around a part of the outer circumference of the sieve drum (S), - a treatment chamber (BH) accommodating the sieve drum (S), which chamber is exposed to the gas to be treated, preferably heated air, - within the treatment chamber (BH), a sieve cover (SD) or corresponding flow guide elements are provided surrounding the sieve drum (S) in the area wrapped by the material web (M), by which the gas flowing in the treatment chamber (BH) is directed towards the sieve drum surface, wherein the wall (W) of the treatment chamber (BH), which faces the outer circumference of the sieve drum (S) in the area of wrapping by the material web (M), has, in this area, a decreasing distance to the surface of the sieve drum (S), characterized in that the gas can be supplied to the treatment chamber (BH) at the bottom side thereof via a supply chamber (Z) having a wedge-like sloping top and via a deflection chamber (U) adjoining the supply chamber below the same, wherein the supply chamber (Z) with the deflection chamber (U) is arranged in that region of the treatment chamber (BH) in which the wall is at the greatest distance from the surface of the sieve drum, wherein the supply chamber (Z), the deflection chamber (U), as well as the treatment chamber (BH) have the same working width that corresponds to the working width of the sieve drum (S). <EOS>