环形风扇具有拉链开关。
风扇环形外腔产生的正压湍流射流在内腔负压汇流作用下形成锥形风幕流场，将处于流场范围内的气体及粉尘严密封闭起来，使安全生产得到保障。
The tapered windscreen flow field of the fan is composed of the outer ring turbulent jet and the inner sink, which tightly closes gas and dust to ensure the safety production.
唯一得以标明电梯是一部迅达的就是那个属于特征的环形吸顶式抽气风扇格栅设计。
The only thing that denotes the elevator to be a Schindler is the characteristic annular ceiling ventilation fan grille design.
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