The present invention relates to vent the link mechanism of the bus loop that is formed projecting the handle in the lower portion of the air vents provided in the bus loop, so that no noise occurs in the link mechanism to secure the ventilator to facilitate the opening and closing operation, the bus loop in the ventilation structure, ventilator a link body 20 which is formed integrally provided at the lower ends and the tab 30 on the bottom, one is the inside of the formed into a cylindrical shape fixed to the bus loop and the other end is linked the main body 20 to form the axis of rotation and at both ends is constructed with a cover 40, which is coupled after the components are combined on a rotary arm 50, the link body 20 through to the load.
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