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2021 International Mechanical Code, soft-cover

2021 IMC establishes minimum regulations for mechanical systems using prescriptive and performance-related provisions. The IMC was developed with broad-based principles that make possible the use of new materials, methods and design.

Important changes in the 2021 IMC® include:

  • Clothes dryer exhaust terminals required to be at least 3 feet from any opening into a building.

  • Polyurethane spray-applied foam on the exterior of ducts in attics and crawl spaces required to meet specific smoke and flame index limits.

  • Fire and smoke dampers must be provided with approved access for inspection and maintenance.

  • Refrigerant tables updated to include new refrigerants.

  • Addition of condensate termination identification markings and discharge restrictions.

  • Approved factory-built combination intake/exhaust terminations permitted, relaxing separation requirement.

  • 30% reduction in minimum mechanical ventilation for whole-house balanced ventilation systems……and more


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