| Since about 1992, air conditioning systems have been progressively adapted to use R134a refrigerant gas. This gas does not contain chlorine and is thus harmless to the ozone layer. |
| Up to about 1992, air conditioning systems used to use R12 refrigerant gas. This FHC has a high potential for depleting the ozone layer due to its chlorine atoms, as well as a high potential for intensifying the greenhouse effect. |
| For environmental reasons, releasing the refrigerant gas into the atmosphere is prohibited (please refer to legislation and standards) → Chapter. |
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