Respiratory protectors are also, like gas masks, used in jobs exposed to chemical gases and liquids in heavy industry, and dust masks are used when the worker is exposed to dust and fumes in the air-breathing for a long time.
Respiratory protectors are divided into two classes according to their protection features;
• Gas masks (half face, full face) and filter types
• Dust masks (with valve, without a valve, conical, foldable, ffp3, ffp2, ffp1)