Rotating chimney cowl - circular base - designed to eradicate downdraught, whilst the rotating action assists ventilation. Circular base on double ball bearings. It does not use electricity but exploits the action of the wind and guarantees the ventilation and air exchange in rooms technicians such as electrical cabins, gas cabins, septic tanks, and confined environments generally. It also allows for evacuation of fumes and vapors, increasing the draft of the chimney