2027 Uniform Mechanical Code (UMC)

Stay current with the latest requirements for mechanical systems with the 2027 Uniform Mechanical Code (UMC®). This edition provides comprehensive requirements for the installation and maintenance of heating, ventilating, cooling, and refrigeration systems, while allowing flexibility for innovation and emerging technologies.

This product giving mechanical professionals a convenient and versatile reference for office, field, inspection, and project use.

The 2027 UMC is the ninth edition developed through the ANSI Consensus process and is designated as an American National Standard by the American National Standards Institute (ANSI). Its development incorporates contributions from a broad range of stakeholders across the built environment, including consumers, enforcing authorities, installers and maintainers, labor, manufacturers, research and testing laboratories, technical experts, and code users.

Key Changes in the 2027 Uniform Mechanical Code

The 2027 UMC introduces new and updated provisions addressing ventilation, refrigeration, mechanical systems, energy infrastructure, safety, testing, and emerging technologies.

Key changes include:

• New exhaust ventilation requirements for auto repair garages, indoor DC fast‑charging EV spaces, and LP‑Gas facilities
• Updated certification pathways for qualified personnel performing ventilation system testing, adjusting, and balancing (TAB) and duct leakage testing
• New provisions for laboratory exhaust systems
• New provisions for exhaust systems conveying radioactive materials
• New prescriptive requirements for grease duct leakage testing
• Updated provisions for refrigeration systems including releasable refrigerant charge limits (EDVC framework), machinery rooms, and refrigerant piping/shaft requirements
• New provisions for masonry heaters, including dedicated compliance pathways for listed and site‑built systems
• New provisions for district energy systems, expanding beyond Ambient Temperature Loop (ATL) systems
• New Appendix H provides minimum requirements to address Legionella growth in mechanical systems
• New Appendix K with recommended configurations for maintaining quality of heat transfer fluids in closed‑loop hydronic systems
• New Appendix M providing recommended practice for hydrogen fuel gas piping systems
• New Appendix O addressing minimum mechanical system requirements for tiny houses

Stay Current with the 2027 UMC

Whether you are designing, installing, testing, inspecting, or maintaining mechanical systems, the 2027 Uniform Mechanical Code provides an updated reference to current mechanical requirements and industry practices.