工业企业设计卫生标准(GBZ 1-2010)

6.1.5.1 h) 局部机械排风系统各类型排气罩应参照 GB/T 16758 的要求，遵循形式适宜、位置正确、风量适 中、强度足够、检修方便的设计原则，罩口风速或控制点风速应足以将发生源产生的尘、毒吸入罩内，确保达到高捕集效率。局部排风罩不能采用密闭形式时，应根据不同的工艺操作要求 和技术经济条件选择适宜的伞形排风装置。

Hygienic Standardsfor the Design of Industrial Enterprises (GBZ 1-2010), Article 6.1.5 h)

Localmechanical exhaust air system's exhaust hood of all types must follow these

designprinciples according to those specified in GB/T 16758: the form is appropriate,

theposition is exact, the blowing rate is moderate, the intensity is adequate andthe

overhaul iseasy to carry out; the wind speed at the hood opening or control point

shall beadequate to inhale pollution sources' ash, poison into the hood so as to ensure

a higharresting efficiency. When the local exhaust hood cannot be in sealed form,

appropriateumbrella type umbrella-type air exhaust devices shall be selected

accordingto different technological operating requirements and the conditions.