Description
2024 International Mechanical Code (IMC)
The 2024 International Mechanical Code sets minimum regulations for mechanical systems, using prescriptive and performance related provisions. Published by the International Code Council, it covers HVAC, exhaust systems, boilers and refrigeration, and is used by mechanical contractors, engineers and inspectors.
This edition changes its format as well as its technical rules. The layout moves to a single column with improved font readability, and QR codes in the margins replace margin lines for tracking code changes.
A2L refrigerants and piping safety
The 2024 code prohibits A2L refrigerants in human comfort applications unless specific safety sensors and mitigation systems are installed, including leak detection. It also mandates distinct marking for piping systems to prevent cross-connection hazards.
Ventilation and equipment updates
Ventilation rates for ambulatory care facilities are updated to match ASHRAE 170. The code adds new listing and installation requirements for residential steam bath generators, and it clarifies rules for the termination of commercial kitchen exhaust outlets relative to property lines.
What is new in this edition
- New safety protocols for lower flammability (A2L) refrigerants in HVAC systems, requiring leak detection and mitigation.
- A modernized single-column format with QR codes replacing margin lines for tracking code changes.
- Enhanced requirements for distinct marking and labeling of piping to prevent cross-connections.
- Ventilation rates for ambulatory care facilities updated to align with ASHRAE 170.
- New listing and installation requirements for residential steam bath generators.
- Clarified rules for the termination of commercial kitchen exhaust outlets relative to property lines.
Book details
- Title: 2024 International Mechanical Code (IMC)
- Publisher: International Code Council
- Edition: 2024
- ISBN-13: 9781959851769
Questions buyers ask
Who uses the International Mechanical Code?
Mechanical contractors, engineers and inspectors use it to design and check HVAC, exhaust, boiler and refrigeration systems.
What changed in the 2024 edition?
The layout moves to a single column with QR codes for tracking changes, and the technical rules add A2L refrigerant safety protocols, piping marking requirements, updated ambulatory care ventilation rates, and new steam bath generator rules.
Does this edition cover A2L refrigerants?
Yes. It prohibits A2L refrigerants in human comfort applications unless specific safety sensors and mitigation systems, including leak detection, are installed.
How does the code use QR codes?
QR codes appear in the margins in place of the older margin lines, so a reader can scan to track technical changes.
Does it cover healthcare facility ventilation?
Yes. Ventilation rates for ambulatory care facilities are updated to align with the ASHRAE 170 standard.
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