说明进入实验室的空气质量在很大程度上取决于建筑物顶部烟囱的高度，以及相对于烟囱位置和盛行风的新鲜空气入口位置。如果排气和通风系统设计不当，烟囱的常规或意外排放物可能会再循环到建筑物中。提出了一种客观的方法，用于评估烟囱设计对新鲜空气入口和行人区浓度水平的影响。该方法检查当地气象学、预期的化学排放、气味和健康阈值。然后采用筛选方程估算最大浓度。如果超过阈值，则使用风洞测量来改进浓度估计并改进烟囱设计。给出了这些方法的示例。关键词:实验室，室外空气，送风，烟道，进气口研讨会，ASHRAE Trans。 1991年，第97卷，第2部分

States that the quality of the air that enters a laboratory depends a great deal on the height of the stacks on top of the building and the location of the fresh air intakes relative to the stack location and the prevailing winds. If the exhaust and ventilation system are poorly designed, routine or accidental emissions from the stacks can be recirculated into the building. Presents an objective approach used to evaluate the effect of stack design on concentration levels at fresh-air intakes and pedestrian areas. The method examines local meteorology, expected chemical emissions, and their odour and health thresholds. Screening equations for estimating maximum concentrations are then employed. If thresholds are exceeded, wind tunnel measurements are then employed to refine concentration estimates and to improve the stack design. Presents examples of the methods.KEYWORDS: Laboratories, outdoor air, supply air, flues, air inlets