抽气通风 drawing ventilation; exhausting ventilation; extract ventilation; induced draft; ventilation by extraction 抽气通风机 induced draft engine .
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Clean refrigerating machines, cooling tower, wind set, A/Ccontrolling system, exhausting and ventilation system.
定期清洗制冷机、冷却塔、风柜系统、风盘、空调控制系统和通风排气系统。
Emphasizes that the resistance of the pipe system and the air infiltration rate under smoke exhausting are far more than those under ventilation, so as to need a careful calculation.
强调排烟工况下管网总阻力、漏风量均远大于通风空调工况，必须严格认真地计算。
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