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It is the basic parameter for certification tests carried out on respirators in European standard EN149: 2001, NIOSH 42 CFR Part 84, and Australian Standard AS1716 . N95 filter respirator retains 95% of the most penetrating particles, meaning 0.3-micrometre (μm) particles, while the N99 retains 99%, and the N100, close to 100%.

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[PPT]

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It is the basic parameter for certification tests carried out on respirators in European standard EN149: 2001, NIOSH 42 CFR Part 84, and Australian Standard AS1716 . N95 filter respirator retains 95% of the most penetrating particles, meaning 0.3-micrometre (μm) particles, while the N99 retains 99%, and the N100, close to 100%.

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