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2015 Uniform Mechanical Code (UMC®) Now Available.

The International Association of Plumbing and Mechanical Officials (IAPMO®) has released the hardcopy and digital versions of its 2015 edition of the Uniform Mechanical Code
(UMC®). Both the hardcopy and eBook version, viewable on computers, tablets and smart phones, can be purchased and downloaded via the IAPMO web store at

In December, the IAPMO Standards Council issued the 2015 edition of the UMC®, designated as an American National Standard for the fifth time.

IAPMO’s ANSI-accredited process brings together volunteers representing a variety of viewpoints and interests to achieve consensus on mechanical practices. The UMC is the only mechanical code of practice to be designated an American National Standard.

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Significant changes to the UMC include:

  • New general requirements for condensate wastes and control, installation of appliances on sloped roofs, and clearances to combustible constructions
    (Chapter 3).

  • New ventilation provisions, such as the classification of recirculated and transferred air, parking garages exhaust, and natural ventilation (Chapter 4).

  • New exhaust provisions for clothes dryers, Type I hoods and grease ducts, dishwashing machines, and downdraft appliances (Chapter 5).

  • New duct systems requirements for factory-made air ducts, plastic ducts, and for ducts used in underground installations (Chapter 6).

  • New appliances provisions, such as electric duct heaters, electric ranges, refrigeration appliances, and ductless mini-split systems (Chapter 9).

  • New refrigeration system requirements, such as the refrigeration concentration limit, ventilation for refrigeration machinery rooms, pressure vessels, and pressure relief valve discharge (Chapter 11).

  • New hydronic systems provisions (Chapter 12).

First published by IAPMO in 1967, the UMC is developed to govern the installation and inspection of mechanical systems as a means of promoting the public’s health, safety and welfare. Developed and subsequently republished at the conclusion of each three-year code cycle, the UMC is designed to provide consumers with safe mechanical systems while, at the same time, allowing latitude for innovation and new technologies.

The public at large is encouraged and invited to participate in IAPMO’s open consensus code development process. A code development timeline and other relevant information are available at IAPMO’s website,
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Sponsor of the Uniform Codes, IAPMO – The International Association of Plumbing and
Mechanical Officials – works in concert with government and industry for safe, sanitary
plumbing and mechanical systems. Learn more about IAPMO at

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