among the most used fans in Factories and industrial sheds. Warehouses. Livestock farms. Poultry farms. Commercial/residential complexes. Sanitary facilities and... Due to the lack of need for electrical energy, fans Air vents can be installed on sloping or flat surfaces, and while using wind power, they create suction. Air vents are designed and built in such a way that even if the air vent is fixed, rain water does not enter the channel and the installed place. .