One should never enter a permit-requiring confined space without a safety attendant on duty and adequate air testing

True







If the confined space has contained hazardous substances, it is important for the confined space to be ______ before entry

Emptied and purged







Air in the confined space should be tested for _____

Oxygen content, flammability, and toxicity







What are the OSHA acceptable limits for oxygen in a confined space?

19.5%-23.5%







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