Red Seal Steamfitter Pipefitter Practice Questions - Red Seal Steamfitter Pipefitter (Interprovincial Standards) Exam

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A confined space such as a boiler or large tank must be tested before entry. What is the FIRST atmospheric parameter that should be confirmed?

Carbon dioxide level Oxygen concentration (between approximately 19.5% and 23%) Relative humidity Ambient light level

Correct Answer:

Oxygen concentration (between approximately 19.5% and 23%)

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