The most common refrigerants that require recovery and recycling are R-22, R-410A, and R-134a. R-22, also known as Freon, is an ozone-depleting substance being phased out under the Montreal Protocol. R-410A is a hydrofluorocarbon (HFC) refrigerant commonly used in air conditioning systems, while R-134a is an HFC refrigerant used in automotive and commercial refrigeration systems. Proper recovery and recycling of these refrigerants are crucial to minimize their environmental impact.