对于大多数空间，医疗保健设施使用每小时2次换气（ACH）的室外换气率。这个数字可以追溯到19世纪70年代的建筑文学。它在规范和标准中已被沿用了近140年（！），目前在ASHRAE Standard170中。本文基于Ashraestard 62.1的当代方法，并以其他来源为基准，提出了医疗空间室外空气通风的另一种基本原理。文中给出了空间和室外空气通风率表，并给出了相关理论依据。 本文仅讨论室外空气，不考虑总通风量或其他通风变量的考虑和比较。引文:2017年冬季会议，内华达州拉斯维加斯，会议论文

Health care facilities use an outdoor air ventilation rate of 2 air change per hour (ACH) for most spaces. This number can be traced back to thearchitectural literature of the 1870s. It has been carried forward in codes and standards for nearly 140 years (!), and currently is in ASHRAE Standard170. This paper proposes an alternative rationale for outdoor air ventilation in health care spaces, based on the contemporary methodologies of ASHRAEStandard 62.1, and benchmarked against other sources. A table of spaces and outdoor air ventilation rates is presented, with supporting rationale for therates. This paper deals only with outdoor air, and excludes consideration and comparisons of total ventilation rate or other ventilation variables.