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Shanghai Allmarine Industry Co.,Ltd.
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Two-speed ventilation fans

11/29/2012 6:42:49 PM
Two-speed ventilation fans are commonly used in special occasions, such as the exhaust fan fire usually use low-grade speed for ordinary exhaust the air supply in the event of a fire, you need to use the high speed high wind to fire smokegas discharge.The two-speed fan is installed in a two-speed motor, the motor is usually by changing the motor winding stages, or one motor is a plurality of windings to achieve the purpose of the shift.
Ventilation fans fire one machine to achieve the purpose of common two -speed the ordinary electricity connected low speed, fire electricity access high speed. Two-speed motors are generally 2/4, 4/6, 6/8 several series ratio, choose two-speed fan series based on high-speed, low- speed wind than to elect the right and two-speed motor.