Description
Design and install mechanical systems with the latest safety standards using the 2021 International Mechanical Code (IMC). Published by the International Code Council (ICC), this code establishes minimum regulations for mechanical systems using prescriptive and performance-related provisions. It is the go-to resource for mechanical contractors, engineers, and inspectors, covering everything from HVAC and exhaust systems to boilers, water heaters, and refrigeration.
The 2021 Edition introduces pivotal changes to align with environmental goals and new technologies. Most notably, it incorporates new requirements for the use of A2L refrigerants (lower flammability), updating machinery room standards to accommodate these eco-friendly alternatives. The code also refines the rules for clothes dryer exhaust, specifically regarding the use of booster fans and termination locations. Additionally, it clarifies requirements for ventilation air intake distances from hazardous sources and updates the standards for commercial kitchen hoods to improve fire safety.
Key Updates in the 2021 Edition:
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A2L Refrigerants: New definitions and safety standards for Group A2L refrigerants, acknowledging the shift toward lower-GWP (Global Warming Potential) options.
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Clothes Dryer Exhaust: Updated provisions for domestic dryer exhaust, including new listings for booster fans (UL 705) and termination limits.
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Ventilation Intakes: Clarified separation distances between outdoor air intakes and potential contaminant sources like exhaust outlets.
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Refrigerant Piping: New requirements for the identification and protection of refrigerant piping.
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Commercial Kitchens: Revised clearances for Type I hoods and updated grease duct testing protocols.
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Atrium Smoke Control: Adjusted requirements for smoke control systems in large volume spaces.
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