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Respirator fit test
The fitting characteristic of a respirator tight fitting facepieces is the ability of respirator's mask separate worker's respiratory system from polluted surrounding air. This is achieved through tight touch (without gaps) the mask and the face around the perimeter of their contact. Because the workers cannot be protected if there are gaps, it is necessary to find it before employee enter into contaminated workplace air. Such gap ''(or leakage)'' search (fit test) may be performed by different ways.
== History of fit test ==
The effectiveness of various types of respirators was measured not only in the laboratories, but also in the workplaces.〔 These numerous measurements have shown that, in practice, negative pressure tight fitting respiratory protective devices (RPD) effectiveness depend on leakage between the mask and the face, not on the filters/canisters (if they are correctly chosen).〔 This decrease in efficiency due to leakage had manifested on a large scale during the first world war, when the gas masks were used to protect against chemical weapons. If the soldiers wore masks sloppy, and if the mask didn't fit their faces, people could die. The Russian army began to use short-term exposure to chlorine at low concentrations to solve this problem in 1917.〔〔 Such testing also helped to convince the soldiers that their gas masks are reliable - because respirators were a novelty.〔 Later, industrial workers were trained in the gas chambers under the influence of harmful substances in the USSR (in preparation for the Second World War),〔〔〔 and late〔'. German firefighters used a similar test between the first and second world wars.〔
Diluted chloropicrin was used to test industrial gas masks, but not often.〔 The Soviet Army used chloropicrin in tents floor space of 16 square meters.〔
Now the US army carried out military training with a special irritating smoke.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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