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Check the Oxygen Content: |
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It must be between 19.5% and 23.5% |
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Check at different levels to make sure that all of the atmosphere is safe |
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Check for Combustibles: |
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Less than 10% of LEL
(LEL is Lower Explosive Limit) |
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Check for Toxic Gasses |
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Any other hazardous materials as determined by the use of the space.
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