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No matter how well a respirator seals to the face and how efficient the filter media is . For more information see 3M Technical Bulletin: What is an N95 Respirator? . Surgical respirators are designed without exhalation valves . Some FFRs are available with a carbon layer that will provide relief against low levels of odors.
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1 May 2020 . Should you wear face masks even when lockdown lifts and cities reopen . The institute says not to seek out medical or surgical-grade masks for . They might include an exhalation valve to make it easier to breathe while wearing them. . Many sites provide patterns and instructions that use multiple layers.
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General Description: Respirator mask protecting against airborne pathogens. . Material: non-woven filter layer Filtration level: > 95 % for particles from 0.1 to 0.3.
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