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A 608 certification is required to purchase R-22, R-410a, R-404a, R-422D, and MO99.
For most do-it-yourself consumers, these changes will have little effect. Two-pound cans of R-134a can still be purchased without certification.
Technicians do have several programs available to them through which they can be certified, if they have not yet been so. MACS, Robinair, and ASE all offer certification programs for a small fee, and several automotive employers also provide the necessary resources to certify their own people. Certification is a requirement of the United States Clean Air Act of 1990. Visit the U.S. EPA website for a brief overview of requirements regarding Section 609 certification.