從上表可以 判斷：啟動噪音原因為單體扇框中心柱垂直度偏大+扇框鎖完螺絲

From the above table, it can be judged that the cause of the starting noise is that the verticality of the central column of the single fan frame is too large + the verticality of the central column changes after the screw of the fan frame is locked.

From the above table can be judged: the start noise cause is the single fan box center column vertical is too large , fan box after the lock screw, the center column vertical ity of the variation caused.

It can be judged from the above table that the starting noise is caused by the large perpendicularity of the central column of the single fan frame + the variation of the perpendicularity of the central column after the screws of the fan frame are locked.<br>