A ventilation system for external walls in modern buildings comprises a lower sill (10) with horizontal holes (2) extending to the exterior. A waterproof film (5) is placed between the base holes (2) and the sanitary hollow slab (4). An upper sill (11) is also equipped with horizontal holes extending to the exterior and is placed between the top of the double insulation partition (6) and the ceiling (12). The partition (6) is mounted parallel to the external wall (4) and a cavity (9) is formed along the their total length. The cavity forms a pathway along which air can move form the inside of the building to the outside of the building through the holes in the upper sill (11), down through the cavity and out through the holes in the lower sill (1).
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