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AbstractIntroductionMethodsResultsDiscussionConclusionAcknowledgmentsThis study was conducted to investigate the protection of disposable filtering half-facepiece respirators of different grades against particles between 0.093 and 1.61 μm. A personal sampling system was used to particle size-selectively assess the protection of respirators. The results show that about 10.9% of FFP2 respirators and 28.2% of FFP3 respirators demonstrate assigned protection factors APFs below 10 and 20, which are the levels assigned for these respirators by the British Standard. On average, the protecti…【Get Price】

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