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How do we choose from dozens of masks online? What are ASTM or En14683 standard? What are BFE, VFE, PFE? | Medium
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Wellsamed Wellsamask Medical Face Mask, Mouth and Nose Protection, Surgical Masks, Disposable, 50 Pieces, CE/EN 14683 Type IIR (Type 2R) 3-Ply : Amazon.de: Business, Industry & Science
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