If there is a "large" release of R-134a refrigerant gas in a confined area, which of the following statements would be true?

Correct Answer: Option C — a self-contained breathing apparatus (SCBA) would be required before entering the space

A major release of R-134a in an enclosed machinery space displaces available oxygen, creating a severe asphyxiation hazard that mandates donning a Self-Contained Breathing Apparatus (SCBA) prior to entry.