三角研究所（RTI）为用于一般通风的空气滤清器开发了一种新的部分过滤效率实验室测试方法。该方法提供了一种可靠、准确的方法，可以测量0.3至10µm粒径范围内的空气滤清器部分效率。需要进行部分效率测试的原因有几个:（1）对室内空气质量（IAQ）的日益关注；（2） 对于直径小于10µm的颗粒，过滤效率通常高度依赖于颗粒大小；（3） 当前ASHRAE效率测试（52.1-92及其前身52-76）的局限性，设计上无法区分颗粒大小； （4）可吸入颗粒物通常分类为直径<10µm的颗粒物。新方法的实施将为空气滤清器社区带来几大好处。

The Research Triangle Institute (RTI) has developed a new fractional filtration efficiency laboratory test method for air cleaners used in general ventilation. The method provides a reliable and accurate means of measuring air cleaner fractional efficiencies over the particle diameter size range of 0.3 to 10 µm.The need for a fractional efficiency test comes from several sources: (1) the growing concern with indoor air quality (IAQ); (2) the fact that filtration efficiency is often highly particlesize dependent for particles <10 µm diameter; (3) limitations of the current ASHRAE efficiency test (52.1-92 and its predecessor 52-76) which, by design, cannot differentiate between particle size; and (4) that respirable particles are generally classified as those <10-µm diameter.Implementation of the new method will provide several benefits to the air cleaner community.