IMPROVED ROOF GEL FOR HEAVEN WATER DISCHARGE AND SUPPRESSED USE IN UV HEAVEN WATER DISCHARGE SYSTEM.

摘要

Roof gully for rainwater discharge in negative pressure, which gully has at least one gully bottom (2) and an air shut-off valve (3), wherein the gully bottom (2) is provided with an overflow edge (4) which corresponds to the highest sand in the placed condition of the gully bottom ( 2), characterized in that the air shut-off valve (3) has a hat-shaped design and comprises a bottom edge (8) which, in the placed position, is located outside the overflow edge (4) and this bottom edge (8) is located lower than the bottom side of the air shut-off valve (3) ) at the overflow edge (4).