AZ ROC C-49 Industrial Refrigeration Practice Questions - Arizona ROC C-49 Industrial Refrigeration (Commercial) Examination Exam

Under ASHRAE Standard 34, what is the safety classification for anhydrous ammonia (R-717)?

A1 (lower toxicity, no flame propagation) B2L (higher toxicity, lower flammability with burning velocity ≤ 10 cm/s) A2L (lower toxicity, lower flammability) B1 (higher toxicity, no flame propagation)

Correct Answer:

B2L (higher toxicity, lower flammability with burning velocity ≤ 10 cm/s)

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