Building Code committee backs emergency-rule updates to allow A2L refrigerants in split HVAC systems
The Washington State Building Code Council's NDPE committee voted Oct. 10 to recommend modifying an existing emergency rule for the 2021 International Mechanical Code to align with recent ASHRAE 15 clarifications on A2L (mildly flammable) refrigerants and asked staff to pursue a path to incorporate similar language into the 2024 code.
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On Oct. 10, 2025, the NDPE committee of the Washington State Building Code Council recommended that the full council establish an emergency basis to modify an existing emergency rule for the 2021 International Mechanical Code (IMC) to reflect recent clarifications in ASHRAE 15 about A2L refrigerants, and separately recommended staff pursue a pathway to add corresponding language to the 2024 IMC filing (CR 102).
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