通风是有效控制尘毒危害的重要方法，全面通风是通风的一种类型，且有些作业场所必须采用全面通风防护设施，而全面通风量是全面通风的重要参数和评价指标。阐述了全面通风量的定义和适用范围，讨论了单一物质和多种物质并存时全面通风量的计算方法，并详细阐述了室内环境有害物质浓度限值Ys的确定方法，分析了基于通风换气次数全面通风量的计算方法，提出了在建设项目职业病危害预评价和控制效果评价中全面通风量评价指标的应用方法。%Ventilation is an effective method to control toxic and dust , and full ventilation is one type of ventilation . In some workplaces the full ventilation must be used to control occupational hazards , and the full ventilation volume is an important parameter and evaluation index for full ventilation .The definition and the suitable scope of full ven-tilation volume were described , and the calculation methods of full ventilation volume were discussed , when single substances and a variety of substances existing in one workplace .The determining method of hazardous substances concentration limit in workplace called Ys was discussed in detail .The calculation method of full ventilation volume based on the ventilation rate was also analyzed .The application method of the full ventilation rate was put forward in the occupational hazards evaluation at lass , which including the pre -evaluation and control effect evaluation .
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