URS Corporation, Pittsburgh, PA, USA.
Am J Infect Control. 2012 May;40(4):375-80. doi: 10.1016/j.ajic.2011.05.003. Epub 2011 Aug 23.
A concern with reuse of National Institute for Occupational Safety and Health-certified N95 filtering facepiece respirators (FFRs) is that multiple donnings could stress FFR components, impairing fit. This study investigated the impact of multiple donnings on the facepiece fit of 6 N95 FFR models using a group of 10 experienced test subjects per model.
The TSI PORTACOUNT Plus and N95 Companion accessory were used for all tests. After qualifying by passing a standard Occupational Safety and Health Administration fit test, subjects performed up to 20 consecutive tests on an individual FFR sample using a modified protocol. Regression analyses were performed for the percentage of donnings resulting in fit factors (FFs) ≥100 for all 6 FFR models combined.
Regression analyses showed statistical significance for donning groups 1-10, 1-15, and 1-20. The mean percentage of donnings with an FF ≥100 was 81%-93% for donning group 1-5, but dropped to 53%-75% for donning group 16-20.
Our results show that multiple donnings had a model-dependent impact on fit for the 6 N95 models evaluated. The data suggest that 5 consecutive donnings can be performed before FFs consistently drop below 100.
人们担心重复使用美国职业安全与健康研究所认证的 N95 过滤式面罩（FFR）会对 FFR 部件造成压力，从而影响其适配性。本研究使用 10 名经验丰富的测试人员对每组 6 种 N95 FFR 模型进行了多次佩戴试验，以调查多次佩戴对面罩适配性的影响。
所有测试均使用 TSI PORTACOUNT Plus 和 N95 配件。在通过标准职业安全与健康管理局适配测试合格后，受试者使用改良方案对单个 FFR 样本进行了多达 20 次连续测试。对所有 6 种 FFR 模型组合的 10 个佩戴组中产生适配因子（FF）≥100 的佩戴次数百分比进行了回归分析。
回归分析显示，佩戴组 1-10、1-15 和 1-20 具有统计学意义。佩戴组 1-5 的平均每次佩戴有≥100FF 的百分比为 81%-93%，但佩戴组 16-20 的百分比降至 53%-75%。
我们的结果表明，对于评估的 6 种 N95 模型，多次佩戴对适配性有模型依赖性影响。数据表明，在 FF 持续降至 100 以下之前，可以进行 5 次连续佩戴。
