| 摘要 |
PURPOSE: To facilitate positioning work in the case of inserting an installation hole of a boss part of a ventilation fan in a rotation axis by providing a slant face part inclined toward the insertion direction on an end face part on the insertion side on a flat surface part of the installation hole formed roughly and sectionally in a D shape on the boss part of the ventilation fan. CONSTITUTION: A ventilation fan 16 is arranged in a fan casing free to rotate in a ventilating fan for a ceiling, and the ventilation fan 16 is installed on a rotation axis 18 of a motor 17 installed on an upper wall part of a main body frame. In the case of installing this ventilation fan 16 on the rotation axis 18 of the motor 17, a sectionally roughly D shaped installation hole 29 of a boss part 28 is inserted into a head end part of the rotation axis 18 and pressed into it by lowering the ventilation fan 16 from above in a state of arranging the rotation axis 18 upward. At this time, as a slant face part 29b is provided on an end face part on the insertion side of the installation hole 29 of the boss part 28, the head end part of the rotation axis 18 can be guided to a proper position and automatically positioned. |
