Okla. Stat. tit. 59, § 59-1000.30: Federally accepted refrigerants not to be prohibited

or limited in use.

No provision of a building code, any other law, regulation, or

other requirement in Oklahoma may prohibit or otherwise limit the

use of a refrigerant designated as acceptable for use pursuant to

and in accordance with 42 U.S.C. 7671K; provided, any equipment

containing such refrigerant is listed and installed in accordance

with safety standards and use conditions imposed pursuant to such

designation.