What are common refrigerant types used in commercial kitchens?

The selection of refrigerants listed includes widely used options in commercial refrigeration systems, providing a good representation of those that are prevalent in modern installations.

R-134A is a hydrofluorocarbon (HFC) refrigerant favored in commercial refrigeration due to its stability and efficiency at moderate temperatures, making it suitable for refrigeration and air conditioning applications. R-410A, another HFC, is utilized in newer systems due to its higher efficiency and lower environmental impact compared to older refrigerants; it has become the standard for many air conditioning systems. R-404A, a blend of HFCs, is commonly used in low and medium-temperature refrigeration applications, especially in food service and industrial contexts, for its excellent thermal efficiency and non-ozone-depleting properties. Lastly, R-22, an older refrigerant, has been historically significant for its widespread use, though it is being phased out due to environmental regulations.

Understanding these refrigerants is crucial for technicians working with commercial food equipment, as it not only affects system efficiency but also compliance with environmental regulations. This diverse mix of refrigerants in the correct answer reflects their application in various cooling scenarios found in commercial kitchens.