Because filter-type gas masks are simple in structure, lighter in weight, and easier to carry, they are often used in places where they produce, store, or use known toxic and harmful substances, and are widely used. However, there are several application restrictions for use in firefighting operations:
1, filter gas mask is not suitable for severe hypoxia
Because filter-type gas masks must be used under the condition that the oxygen content in the air must not be less than 18%, and in the fire area, oxygen depletion due to burning will be severely deficient, even if the filter-type gas mask filters The effect is no better, but the filtered air does not guarantee normal human breathing.
2, filter gas mask does not apply to tobacco poisoning
Filter gas masks can only be used in locations where the concentration of toxic gases is not more than 2%, so it is not suitable for fires with high concentrations of smoke.
3, gas mask is not suitable for toxic and hazardous substances in a complex place
Because filter-type gas masks are for some or some toxic and harmful substances, their selectivity please. Therefore, it is impossible to provide protection against the indeterminate substances resulting from the fire.
Therefore, fire-fighting combat cannot use filter-type gas masks.
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