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Gas masks are divided into two categories:
There are two most common materials for masks:
Gas masks and filter boxes should be matched. Whether the mask can protect against viruses, it is important to choose the appropriate filter box.
No. 3 filter box is the most common, organic benzene alcohol ketone aldehyde.
No. 4 filter box can prevent ammonia and hydrogen sulfide.
7 filter box filters acid and removes sulfur and chlorine.
Other filter boxes are rarely used. Finally, I will give you a table.