在污染问题可能持续存在的场合,最常用的控制方法是利用局部排风。局部排风系统的唯一目的是将受污染的空气排出,而不是提供通风本身.这种通风系统的组成部分有:与系统相连的一个或多个吸风口(罩子或条缝罩),输送污染空气的管路、为系统中空气流动提供动力的风机或类似装置。此外、可能还需要净化装置、烟囱和监控设备。 Where pollution problems may persist, the most common method of control is to use local exhaust. The only purpose of a local exhaust system is to discharge the contaminated air, rather than provide the ventilation itself. The components of this ventilation system are: One or more suction openings (hoods or strips) connected to the system, conveying the contamination Air lines, fans or similar devices that power the flow of air in the system. In addition, purification devices, chimneys, and monitoring equipment may also be needed.