A technician is preparing to service an A2L refrigerant system in a small, enclosed mechanical room. Which of the following actions is MOST critical to perform before starting any work that involves opening the refrigerant circuit?
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A
Ensure all tools are properly calibrated.
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B
Verify the model number of the equipment.
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C
Establish and maintain mechanical ventilation in the work area.
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D
Check the ambient temperature and humidity.