Final answer:
Devices used for refrigerant recovery must be able to extract heat from a refrigerant and exhaust it to the environment.
Step-by-step explanation:
All devices used for refrigerant recovery must meet the requirement of being able to extract heat from a refrigerant and exhaust it to the environment. This is typically achieved through a cycle called the refrigeration cycle. The key components of this cycle include an evaporator, a compressor, a condenser, and an expansion valve. These components work together to extract heat from the desired area and transfer it to the surroundings.