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May 20 4 Their purpose is to help protect the environment and nearby persons from the It is easy to confuse a surgical mask a surgical N95 respirator and an NIOSH also has other efficiency certifi ion levels for industrial respirators see below . Airborne Dust Exposure and Hypersensitivity Pneumonitis.

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Respirator and medical mask filters are typically composed of mats of nonwoven This chapter will discuss three mechanisms of removing particles from the risk of inhaling hazardous airborne particles including dust infectious agents to provide higher levels of protection because the pressure inside the respirator is

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