呼吸防护用品按用途可分为防尘、防毒和供气式3类,按防护原理可分为过滤式(又称净化式)、自给式(又称隔绝式)。呼吸防护用品是预防尘肺病和职业中毒等职业病的重要防护产品,主要品种有防尘口罩、防毒面具、空气呼吸器、氧气呼吸器等。防毒面具是一种过滤式呼吸防护用品,是利用 Respiratory protective equipment can be divided into three categories according to the use of dust, poison and gas supply type 3, according to the protection principle can be divided into filter (also known as purification), self-sufficient (also known as isolated). Respiratory protective equipment is an important protective product against occupational diseases such as pneumoconiosis and occupational poisoning. The main products are dust masks, gas masks, air respirators and oxygen respirators. Gas mask is a filter respirator, is to use