Gas-free engineer
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A gas-free engineer (GFE) is a person that has successfully completed a similarly-named training course offered by the United States Navy. The gas-free engineer is thereby qualified to certify a confined space as being safe to enter without the use of an air-purifying or supplied air (SAR/SCBA) respirator. The confined space would, however, need to be ventilated during entry to ensure an adequate supply of breathable air.
[edit] References
U.S. Navy GFE Resources Index
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