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The ultimate product of this effort, the first
Uniform Mechanical Code, was published by IAPMO, the new name for LACPIA, which was adopted in 1966 when the scope of mechanical work grew beyond plumbing and became more readily available in residential applications. in 1967. Over the last fifty years,
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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 to provide input for the development process. The code is updated every three years. A code development timeline and
437:, including such diverse interests as consumers, enforcing authorities, installers/maintainers, insurance, labor, manufacturers, research/standards/testing laboratories, special experts, and users. The 2012 Uniform Mechanical Code is supported by the
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Two years later, the city adopted the first version of a uniform plumbing and mechanical code developed by the Los
Angeles City Plumbing Inspectors Association (LACPIA) and based on the input from a committee of plumbing inspectors, master and
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by local jurisdictions led to plumbing systems that were incompatible and potentially dangerous. This underscored the necessity of developing a model code that could be uniformly applied across jurisdictions.
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this voluntary code has been adapted by jurisdictions not only throughout the United States, but internationally as well. The consensus development process was first applied to the 2003 edition.
381:'s (ANSI) consensus development procedures. This process brings together volunteers representing a variety of viewpoints and interests to achieve consensus on mechanical issues.
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David Viola, CEO; David Gans, President; Steve
Panelli, Vice President; Hugo Aguilar, Vice President of Codes and Standards; Zalmie Hussein, Code Development Administrator
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The 2012 edition is the fourth edition developed under the ANSI consensus process. Contributions to the content of the code were made by every segment of the
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inspectors recognized that there were no uniform requirements for the installation and maintenance of plumbing systems. At that time, heating was done by
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New requirements for fuel gas piping appliance shutoff valves, test pressure and overpressure protection devices
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New provisions for refrigeration systems, including pressure-limiting devices and hydrostatic expansion
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Chapter 12 - Hydronics (Part 1: Steam and Water Piping; Part 2: Hydronic Panel
Heating Systems)
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New fire-extinguishing equipment and carbon monoxide detection requirements for exhaust systems
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Appendix G - Sizing of
Venting Systems and Outdoor Combustion and Ventilation Opening Design
8:
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Revisions to the requirements for air ducts, including factory-made air ducts and dampers
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Appendix D - Fuel Supply: Manufactured/Mobile Home Parks and
Recreational Vehicle Parks
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New guards and rails requirements for installation of equipment and appliances on roofs
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Chapter 13 - Fuel Gas Piping (Part 1: Fuel Piping; Part 2: Fuel Supply: Manufactured/
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Modifications to the pressure rating requirements for hydronic piping applications
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722:"1926 to 2006: Eight Decades of Excellence," Copyright © 2007 by IAPMO, p. 47-9
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Revisions to the sizing requirements for natural gas and propane piping systems
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New requirements for residential compressed natural gas (CNG) fueling systems
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Appendix C - Installation and
Testing of Oil (Liquid) Fuel-Fired Equipment
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Appendix B - Procedures to be
Followed to Place Gas Equipment in Operation
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Appendix A - Residential Plans
Examiner Review Form for HVAC System Design
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New ventilation requirements for transient and nontransient occupancies
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Chapter 11 - Refrigeration (Part 1: Refrigeration
Systems; Part 2:
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International Association of Plumbing and Mechanical Officials
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International Association of Plumbing and Mechanical Officials
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other relevant information are available at IAPMO's website.
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New tube fastener provisions for radiant heating and cooling
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systems. It is designated as an American National Standard.
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New requirements for piping, tubing and fittings used in
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Plumbing-Heating-Cooling Contractors National Association
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Appendix H - Example Calculation of Outdoor Air Rate
574:Chapter 5 - Exhaust Systems (Part 1: Environmental
90:. Unsourced material may be challenged and removed.
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594:Chapter 9 - Installation of Specific Appliances
481:, protection of piping, mechanical systems and
531:New provisions for factory-built grease ducts
508:Significant changes to the 2021 UMC include:
443:Mechanical Contractors Association of America
686:Uniform Swimming Pool, Spa and Hot Tub Code
53:Learn how and when to remove these messages
766:Heating, ventilation, and air conditioning
512:New Appendix F – Geothermal Energy Systems
597:Chapter 10 - Boilers and Pressure Vessels
493:Refrigeration port protection requirement
270:Learn how and when to remove this message
252:Learn how and when to remove this message
150:Learn how and when to remove this message
580:Commercial Hoods and Kitchen Ventilation
439:American Society of Sanitary Engineering
718:
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691:Uniform Solar Energy and Hydronics Code
578:and Product Conveying Systems; Part 2:
465:Major changes to the 2018 UMC include:
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644:Appendix F - Geothermal Energy Systems
188:Please improve this article by adding
426:companies and the plumbing industry.
379:American National Standards Institute
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623:Chapter 16 - Stationary Power Plants
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88:adding citations to reliable sources
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350:) is a model code developed by the
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641:Appendix E - Sustainable Practices
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626:Chapter 17 - Referenced Standards
620:Chapter 15 - Solar Energy Systems
521:New ventilation requirements for
34:This article has multiple issues.
393:In 1926, a group of Los Angeles
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746:Uniform Mechanical Code Website
614:and Recreational Vehicle Parks)
568:Chapter 3 - General Regulations
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377:The UMC is developed using the
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42:or discuss these issues on the
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591:Chapter 8 - Chimney and Vents
190:secondary or tertiary sources
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617:Chapter 14 - Process Piping
571:Chapter 4 - Ventilation Air
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585:Chapter 6 - Duct Systems
565:Chapter 2 - Definitions
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455:World Plumbing Council
177:relies excessively on
681:Uniform Plumbing Code
469:New requirements for
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84:improve this article
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701:Building inspection
487:New provisions for
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523:indoor air quality
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82:Please help
77:verification
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36:Please help
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364:ventilating
242:August 2020
140:August 2020
755:Categories
707:References
416:journeyman
362:(heating,
322:Key people
212:newspapers
179:references
110:newspapers
39:improve it
16:Model code
576:Air Ducts
403:radiators
45:talk page
655:See also
483:ductwork
395:plumbing
303:Location
557:Content
479:louvers
457:(WPC).
399:boilers
389:History
331:Website
295:Founded
226:scholar
124:scholar
475:tubing
471:piping
370:) and
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233:JSTOR
219:books
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117:books
366:and
360:HVAC
342:The
298:1926
205:news
103:news
348:UMC
181:to
86:by
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