- When the oxygen concentration is lower than 19.5% in anoxic environment, the mask is not suitable for use.
- The concentration of pollutants is too high to endanger life or health. It is not suitable to use this mask when the degree is high.
- The mask shall not be used to protect harmful gas or steam.
- When it is found that the mask is contaminated, damaged or the respiratory resistance changes.
The mask should be replaced in case of major conditions.
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