Description
Ensure the optimal performance and safety of mechanical systems with the 2018 International Mechanical Code (IMC). Published by the International Code Council (ICC), this code establishes the minimum regulations for mechanical systems using prescriptive and performance-related provisions. It is the definitive standard for mechanical contractors, engineers, and inspectors, covering a broad spectrum of systems from HVAC and exhaust to boilers and refrigeration.
The 2018 Edition introduces significant technical updates to accommodate new technologies and materials. A major addition is the inclusion of High-Volume Large-Diameter (HVLS) fans (Section 929), providing specific installation and listing requirements for these increasingly common warehouse fans. The code also modernizes ductwork standards by adding coverage for phenolic ducts and clarifying the rules for duct and pipe insulation in plenums. Furthermore, it addresses safety in commercial kitchens with new provisions for pollution control units in grease exhaust systems and specific clearance exceptions for Type I hoods.
Key Updates in the 2018 Edition:
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HVLS Fans: New section (929) regulating the installation and listing of High-Volume Large-Diameter fans.
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Pollution Control Units: Added requirements for pollution control units installed in grease exhaust systems to extract smoke and odors.
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Phenolic Ducts: New standards for the use and installation of non-metallic phenolic ductwork.
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A2L Refrigerants: Recognized as an option for cooling equipment, reflecting changes in refrigerant technology.
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Garage Ventilation: Clarified “intermittent” operation rules to ensure parking garage exhaust systems never shut off completely (must cycle between full and minimum rates).
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Schedule 10 Steel Pipe: Now permitted for use in mechanical systems, expanding material options beyond Schedule 40.
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