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Respirator Rating Number Class. 95 - Removes 95% of all particles that are at least 0.3 microns in diameter; 99 - Removes 99% of particles that are at least 0.3 microns in diameter; 100 - Removes 99.97% of all particles that are 0.3 microns in diameter or larger. HE or HEPA quality filter.

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Apr 04, 2020 · There is a great range of masks out there, including surgical masks, N95 masks and industrial masks that are widely used against the COVID-19. To choose the suitable masks, depending on the risks you would foresee of yourself exposed to the virus and the amount of time of the exposure, different choices are recommended.

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Surgical molded utility mask > Utility mask. This is based upon the masks’ resistance to synthetic blood, bacterial filtration efficiency (1 – 5 microns), and particulate filtration efficiency (0.1 – 10 microns). (2) The NIOSH respirator certification process does not currently …

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Considerations when using a surgical mask for suspected or confirmed cases. In the majority of situations where standard respiratory protection is needed, a single use surgical mask is appropriate (minimum Level 1 barrier). Refer to Appendix 2 for AS 4381: 2015 Single use surgical face mask

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McKinsey & Company 4 This document compiles ~75 interventions for workforce protection during Return ~75 5 phases of the workforce journey, and 8 levers of protection,

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H2-9 Range-finder signals and stations. H2-10 Rescue work. H2-11 Seamanship. H112-12 Structures, trees, earth formations (aids). Submarine signaling stations. H2-13 Target and torpedo ranges. H2-14 H2-15 Zone system (obsolete, see H7-Time). 112-16 Fog-signal stations. Beacons. H2-17 International ice patrol. H2-18 Time balls and shapes.

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