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Three types of respirators with an N95 or higher filter and the device for quantitative fit test. (A) Cup-type respirator that is preformed to a cup shape (3M 1860 or 3M 1860S (small size)). (B) Fold-type respirator, which is flexible and free-folded (3M 1870). (C) Valve-type respirator, which is similar to the fold-type with the valve reducing exhalation resistance (3M 9332). (D) The quantitative fit test was performed using a PortaCount Plus (TSI Inc., St. Paul, MN).
