2012 Uniform Mechanical Code (UMC) provides complete requirements for the installation and maintenance of heating, ventilating, cooling and refrigeration systems, while at the same time allowing latitude for innovations and new technologies. It is the fourth edition developed under the ANSI Consensus process is designated as an American National Standards by the American National Standards Institute (ANSI). Contributions to the content of this code were made by every segment of the built industry, including such diverse interests as consumers, enforcing authorities, installers/maintainers, labor, manufacturers, research/standards/ testing laboratories, special experts and users.

Significant changes to the 2012 Uniform Mechanical Code include:

• New requirements for piping, tubing, balancing, louvers, protection of piping and ductwork.
• New provisions for evaporative cooling systems.
• Updates were made to Chapter 4 (Ventilation).
• Refrigeration port protection requirements.
• Revised fuel gas purging requirements.
• New requirements for piping, tubing and fittings used in hydronic systems.
• New Appendix A (Residential Plan Examiner Review Form For HVAC System Design).
• New Appendix E (Sustainable Practices) that describes sustainable practice requirements that apply to heating, ventilation and air-conditioning systems and equipment.
• New Appendix F (Examples of Venting System Sizing).
• New Appendix G (Example for the Calculation of Outdoor Air Rate).

IAPMO/ANSI UMC 1-2012.

Includes tabs.