Effect of Fit Testing on the Protection Offered by N95 Filtering Facepiece Respirators Against Fine Particles in a Laboratory Setting
Effect of Fit Testing on the Protection Offered by N95 Filtering Facepiece Respirators Against Fine Particles in a Laboratory Setting
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DOI：
10.1093/annhyg/meq085
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发表时间：
2011-04-01
影响因子：
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通讯作者：
Mckay, Roy
中科院分区：
文献类型：
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作者：
Reponen, Tiina;Lee, Shu-An;Mckay, Roy
目的：本研究调查了通过和未通过适合性测试的四种 N95 过滤式面罩呼吸器 (FFR) 型号的颗粒尺寸选择性保护系数 (PF)。颗粒尺寸范围代表单个病毒和细菌（空气动力学直径 d(a) = 0.04-1.3 μ m）。方法：标准呼吸器适合性测试之后，受试者在测试室中佩戴 N95 FFR，然后对 PF 进行颗粒尺寸选择性测量。然后将所有受试者获得的 PF 值与通过适合性测试的受试者获得的 PF 值进行比较。结果：所有四种 FFR 模型的总体适合性测试通过率为 67%。其中，29% 的 PF < 10（职业安全与健康管理局为此类呼吸器指定的保护系数）。当仅包含通过适合性测试的受试者时，PF 改善了 9%，其值 < 10。平均而言，当仅包含通过适合性测试的受试者的数据时，PF 平均高出 1.4 倍 (29.5/21.5)。在 0.08-0.2 μ m 的粒径范围内始终观察到最小 PF。结论：当受试者通过适合性测试时，总体 PF 增加。结果支持了拟合测试的价值，但也首次表明，无论拟合测试状态如何，PF 都取决于粒径。
Objectives: This study investigated particle-size-selective protection factors (PFs)of four models of N95 filtering facepiece respirators (FFRs) that passed and failed fit testing. Particle size ranges were representative of individual viruses and bacteria (aerodynamic diameter d(a) = 0.04-1.3 mu m).Methods: Standard respirator fit testing was followed by particle-size-selective measurement of PFs while subjects wore N95 FFRs in a test chamber. PF values obtained for all subjects were then compared to those obtained for the subjects who passed the fit testing.Results: Overall fit test passing rate for all four models of FFRs was 67%. Of these, 29% had PFs < 10 (the Occupational Safety and Health Administration Assigned Protection Factor designated for this type of respirator). When only subjects that passed fit testing were included, PFs improved with 9% having values < 10. On average, the PFs were 1.4 times (29.5/21.5) higher when only data for those who passed fit testing were included. The minimum PFs were consistently observed in the particle size range of 0.08-0.2 mu m.Conclusions: Overall PFs increased when subjects passed fit testing. The results support the value of fit testing but also show for the first time that PFs are dependent on particle size regardless of fit testing status.