Which refrigerant must be recovered before opening or diposing of appliance?

Before opening or disposing of an appliance, any refrigerant classified as a controlled substance, such as those included in the Montreal Protocol (like CFCs, HCFCs, and HFCs), must be recovered. This is essential to prevent environmental harm and comply with regulations. Refrigerants must be properly recovered using certified recovery equipment to ensure safe handling and disposal. Always consult local regulations for specific requirements regarding refrigerant recovery.