CROSS FLOW FAN

PURPOSE:To reduce unbalance of a cross flow fan, by providing balancing holes in side end parts of a side, connected with a blower electric motor equipped in the cross flow fan, in an external diametric direction of a side positioning a connection tool connecting the electric motor with the cross flow fan. CONSTITUTION:A disc 3 in a side, connecting a cross flow fan 2 with a blower electric motor 1, is integrally formed by a boss 4 and an elastic material of rubber 7 or the like, forming a side end part. Said disc 3, providing holes 3a in an equal direction and a symmetrical position to a screw 5 for connection use, is balanced by a simple substance of the disc 3. While the boss 4, being integrally formed with the disc 3 by the rubber 7 or the like, provides a hole 4a for positioning for easily aligning the boss 4 to a threaded hole 4b and the balancing holes 3a provided in the disc 3. And the hole 4a of the boss 4 can balance the boss 4 by a simple substance. Consequently, the once through fan 2, decreasing its unbalance and forming a blade 6 and the disc 3 in light weight, can improve performance of a blower and reduce its noise and vibration.