Dust-proof respirators can only be used if the oxygen content is not less than the number of environments
The above data is for reference only.
Some of the dust mask packaging instructions will be written on this.
In general, the lower limit concentration of the oxygen concentration measuring instrument is 19% -19.5%.
It can be considered that the best dust mask in not less than 19% of the air environment.
In general, the lower limit concentration of the oxygen concentration measuring instrument is 19% -19.5%.
It can be considered that the best dust mask in not less than 19% of the air environment.
The above data is for reference only.
Some of the dust mask packaging instructions will be written on this.
