The Ohnsorg Roof Exhaust Vent / deflector hood ensures unhindered exhaust transport in every ventilation system and in all weather conditions. A backflow is excluded. The rain is collected and diverted via the outlet. The successful form of this roof ventilation is inconspicuous, often even decorative, both on the flat roof and on the pitched roof. Optionally with connection frame, closing funnel, tray for pitched roof or flat roof, and insulation. Versions in all known sheet metal types, even in Copper Titanium Zinc, etc.