ISO 23328的本部分给出了一种短期空气中氯化钠颗粒挑战性试验方法，用于评估呼吸系统过滤器（BSF）的过滤性能，用于过滤呼吸气体。ISO 23328的本部分适用于与临床呼吸系统一起使用的BSF。它不适用于其他类型的过滤器，例如用于保护真空源或气体取样管线、过滤压缩气体或保护生理呼吸测量测试设备的过滤器。注:ISO 23328-2阐述了BSF的非过滤方面。

This part of ISO 23328 gives a short-term airborne sodium chloride particle challenge test method for assessing the filtration performance of breathing system filters (BSF) intended for the filtration of respired gases.This part of ISO 23328 is applicable to BSF used with a clinical breathing system. It is not applicable to other types of filter, e.g. those designed to protect vacuum sources or gas sample lines, to filter compressed gases, or to protect test equipment for physiological respiratory measurements. NOTE Non-filtration aspects of BSF are addressed in ISO 23328-2.