Which of the following is NOT a requirement for refrigerant handling?

Mixing refrigerants for better performance is not a requirement for refrigerant handling and is actually discouraged. Each refrigerant is formulated for specific properties and performance characteristics, and mixing them can lead to unpredictable results and may create hazardous situations. For instance, combining different refrigerants can cause chemical reactions that produce harmful byproducts, or can reduce the efficiency of the refrigeration system, leading to higher energy costs and potential system damage.

In contrast, the other listed practices—using proper protective gear, labeling containers of different refrigerants, and recovering refrigerants using approved methods—are all essential for safe and effective refrigerant handling. Proper protective gear minimizes health risks associated with exposure to refrigerants. Labeling ensures that technicians are aware of the contents of containers, preventing cross-contamination and ensuring safety. Recovering refrigerants according to established protocols is critical for environmental protection and compliance with regulations aimed at reducing the release of refrigerants into the atmosphere.