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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q534 - Engineering Safety & Environmental Protection
46. Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?
Fresh air contains approximately 20.8% oxygen by volume; therefore, a space should have 20.8% oxygen to be considered equivalent to fresh air.
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