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Wind Turbo Ventilators operate on the principle of wind passing through a turbine, which in turn rotates it, resulting in the creation of suction inside is thrown out of the opening of the turbine vanes, hence allowing fresh air to be drawn through other openings. Wind turbo ventilators are available in bottom sizes 21" & 24" diameter & also 12", 14", 16" & 18" diameter manufacture on request.