New Refrigerant 2025 Flammable. 1, 2025, must use the new refrigerant. Among the major developments already underway in the hfc phasedown is the adoption of multiple alternatives, most notably a2l (mildly flammable) refrigerants, which.

Due to their mildly flammable characteristics, a2l refrigerants will require updates to standards and building. 1, 2025, must use the new refrigerant.