What gas is used as a coolant instead of CFC?

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  1. #simply
  2. #contain
  3. #deplete
  4. #chlorine
  5. #fluorinated
  6. #substituted
  7. #stratospheric
  8. #compounds
  9. #substances
  10. #being
  11. #ozone
  12. #these
  13. #previously
  14. #increasingly
  15. #where
  16. #processes
  17. #similar
  18. #which