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Has there ever been a ban on designing a new system that uses R403B as the refrigerant gas? If so what year did it come into effect?

April 26, 2017ban designing Gas refrigerant system uses year

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Has there ever been a ban on designing a new system that uses R403B as the refrigerant gas? If so what year did it come into effect?

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Yes as R403B is an HCFC and contains 56% by wt of R22 it falls under the ODS (Ozone Depleting Substance) regulation EN 2037/2000 which banned the use of HCFC refrigerants in new equipment in 2000.