Comparison of Mask Standards, Ratings filter surgical mask in vietnam - Smart Air Filters
Mask standards can be confusing N95, KN95, FFP1, P2, or surgical mask? This quick run-down covers mask types, mask ratings, and their effectiveness at filtering particles. First off, lets start with mask types (or certification types). In general, there are 3 (or sometimes 4) types of commonly used, disposable masks.
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