Internationally, code officials recognize the need for a modern, up-to-date mechanical code addressing the design and installation of mechanical systems through requirements emphasizing performance. The International Mechanical Code®, in this 2015 edition, is designed to meet these needs through model code regulations that safeguard the public health and safety in all communities, large and small.
This comprehensive mechanical code establishes minimum regulations for mechanical systems using prescriptive and performance-related provisions. It is founded on broad-based principles that make possible the use of new materials and new mechanical designs. This 2015 edition is fully compatible with all of the International Codes (I-Codes®) published by the International Code Council (ICC), including the International Building Code®, International Energy Conservation Code®, International Existing Building Code®, International Fire Code®, International Fuel Gas Code®, International Green Construction Code®, International Plumbing Code®, ICC Performance Code®, International Private Sewage Disposal Code®, International Property Maintenance Code®, International Residential Code®, International Swimming Pool and Spa Code™, International Urban-Wildland Interface Code® and International Zoning Code®.
The International Mechanical Code provisions provide many benefits, among which is the model code development process that offers an international forum for mechanical professionals to discuss performance and prescriptive code requirements. This forum provides an excellent arena to debate proposed revisions. This model code also encourages international consistency in the application of provisions.
The first edition of the International Mechanical Code (1996) was the culmination of an effort initiated in 1994 by a development committee appointed by the ICC and consisting of representatives of the three statutory members of the International Code Council at that time, including: Building Officials and Code Administrators International, Inc. (BOCA), International Conference of Building Officials (ICBO) and Southern Building Code Congress International (SBCCI). The intent was to draft a comprehensive set of regulations for mechanical systems consistent with and inclusive of the scope of the existing model codes. Technical content of the latest model codes promulgated by BOCA, ICBO and SBCCI was utilized as the basis for the development. This 2015 edition presents the code as originally issued, with changes approved through the ICC Code Development Process through 2013. A new edition such as this is promulgated every 3 years.
This code is founded on principles intended to establish provisions consistent with the scope of a mechanical code that adequately protects public health, safety and welfare; provisions that do not unnecessarily increase construction costs; provisions that do not restrict the use of new materials, products or methods of construction; and provisions that do not give preferential treatment to particular types or classes of materials, products or methods of construction.
The International Code Council maintains a copyright in all of its codes and standards. Maintaining copyright allows ICC to fund its mission through sales of books, in both print and electronic formats. The International Mechanical Code is designed for adoption and use by jurisdictions that recognize and acknowledge the ICC’s copyright in the code, and further acknowledge the substantial shared value of the public/private partnership for code development between jurisdictions and the ICC.
The ICC also recognizes the need for jurisdictions to make laws available to the public. All ICC codes and ICC standards, along with the laws of many jurisdictions, are available for free in a nondownloadable form on the ICC’s website. Jurisdictions should contact the ICC at email@example.com to learn how to adopt and distribute laws based on the International Mechanical Code in a manner that provides necessary access, while maintaining the ICC’s copyright.
The International Mechanical Code is kept up to date through the review of proposed changes submitted by code enforcing officials, industry representatives, design professionals and other interested parties. Proposed changes are carefully considered through an open code development process in which all interested and affected parties may participate.
The contents of this work are subject to change through both the code development cycles and the governmental body that enacts the code into law. For more information regarding the code development process, contact the Codes and Standards Development Department of the International Code Council.
While the development procedure of the International Mechanical Code ensures the highest degree of care, the ICC, its members and those participating in the development of this code do not accept any liability resulting from compliance or noncompliance with the provisions because the ICC does not have the power or authority to police or enforce compliance with the contents of this code. Only the governmental body that enacts the code into law has such authority.
(Letter Designations in Front of Section Numbers)
In each code development cycle, proposed changes to this code are considered at the Committee Action Hearing by the International Mechanical Code Development Committee, whose action constitutes a recommendation to the voting membership for final action on the proposed change. Proposed changes to a code section that has a number beginning with a letter in brackets are considered by a different code development committee. For example, proposed changes to code sections that have [BG] in front of them (e.g., [BG] 309.1) are considered by the IBC — General Code Development Committee at the Committee Action Hearing.
The content of sections in this code that begin with a letter designation is maintained by another code development committee in accordance with the following:
|[A]||=||Administrative Code Development Committee;|
|[BF]||=||IBC — Fire Safety Code Development Committee;|
|[BS]||=||IBC — Structural Code Development Committee;|
|[BG]||=||IBC — General Code Development Committee;|
|[E]||=||International Energy Conservation Code Development Committee;|
|[F]||=||International Fire Code Development Committee; and|
|[FG]||=||International Fuel Gas Code Development Committee.|
For the development of the 2018 edition of the I-Codes, there will be three groups of code development committees and they will meet in separate years. Note that these are tentative groupings.
|Group A Codes (Heard in 2015, Code Change Proposals Deadline: January 12, 2015)||Group B Codes (Heard in 2016, Code Change Proposals Deadline: January 11, 2016)||Group C Codes (Heard in 2017, Code Change Proposals Deadline: January 11, 2017)|
|International Building Code– Fire Safety (Chapters 7, 8, 9, 14, 26)– Means of Egress(Chapters 10, 11, Appendix E)– General (Chapters 2-6, 12, 27-33,Appendices A, B, C, D, K)||Administrative Provisions (Chapter 1 of all codes except IRC and IECC, administrative updates to currently referenced standards, and designated definitions)||International Green Construction Code|
|International Fuel Gas Code||International Building Code– Structural(Chapters 15-25, Appendices F, G,H, I, J, L, M)|
|International Existing Building Code||International Energy Conservation Code|
|International Mechanical Code||International Fire Code|
|International Plumbing Code||International Residential Code– IRC-B (Chapters 1‒10, Appendices E, F, H, J, K, L, M, O, R, S, T, U)|
|International Private Sewage Disposal Code||International Wildland‒Urban Interface Code|
|International Property Maintenance Code|
|International Residential Code– IRC‒Mechanical (Chapters 12‒24)– IRC‒Plumbing(Chapters 25‒33, Appendices G, I, N, P)|
|International Swimming Pool and Spa Code|
|International Zoning Code|
Note: Proposed changes to the ICC Performance Code will be heard by the code development committee noted in brackets [ ] in the text of the code.
Code change proposals submitted for code sections that have a letter designation in front of them will be heard by the respective committee responsible for such code sections. Because different committees hold code development hearings in different years, proposals for this code will be heard by committees in both the 2015 (Group A) and the 2016 (Group B) code development cycles.
For example, every section of Chapter 1 of this code is designated as the responsibility of the Administrative Code Development Committee, and that committee is part of the Group B code hearings. This committee will conduct its code development hearings in 2016 to consider all code change proposals for Chapter 1 of this code and proposals for Chapter 1 of all I-Codes except the International Energy Conservation Code, the ICC Performance Code and the International Residential Code. Therefore, any proposals received for Chapter 1 of this code will be deferred for consideration in 2016 by the Administrative Code Development Committee.
Another example is Section 606.4 of this code which is designated as the responsibility of the International Fire Code Development Committee. This committee will conduct its code development hearings in 2016 to consider code change proposals in its purview, which includes any proposals to Section 606.4.
In some cases, another committee in Group A will be responsible for a section of this code. For example, Section 607 has a [BF] in front of the numbered sections, indicating that these sections of the code are the responsibility of one of the International Building Code Development Committees. The International Building Code is in Group A; therefore, any code change proposals to this section will be due before the Group A deadline of January 2015, and these code change proposals will be assigned to the appropriate International Building Code Development Committee for consideration.
It is very important that anyone submitting code change proposals understand which code development committee is responsible for the section of the code that is the subject of the code change proposal. For further information on the code development committee responsibilities, please visit the ICC website at www.iccsafe.org/scoping.
Solid vertical lines in the margins within the body of the code indicate a technical change from the requirements of the 2012 edition. Deletion indicators in the form of an arrow () are provided in the margin where an entire section, paragraph, exception or table has been deleted or an item in a list of items or a table has been deleted.
A single asterisk [*] placed in the margin indicates that text or a table has been relocated within the code. A double asterisk [**] placed in the margin indicates that the text or table immediately following it has been relocated there from elsewhere in the code. The following table indicates such relocations in the 2015 edition of the International Mechanical Code.
|2015 LOCATION||2012 LOCATION|
Selected terms set forth in Chapter 2, Definitions, are italicized where they appear in code text. Such terms are not italicized where the definition set forth in Chapter 2 does not impart the intended meaning in the use of the term. The terms selected have definitions that the user should read carefully to facilitate better understanding of the code.