Face mask with ear loops and nose clip. Standard: YY/T0969-2013, EN14683:2014. BFE ≥95%.
Bacterial Filtration Efficiency (BFE) is the effectiveness of a material to filter bacteria of a specified particle size, 3.0 µm (micron) ± µm. This is expressed as a percentage of a quantity that does not pass through the material.
Usage time max 4 hours.