ICC IMC-2021 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 edition include:
Important changes in the edition 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.
- Continuous operation requirement for manicure and pedicure station exhaust systems.
- Grease duct horizontal cleanout required within 3 feet of a horizontal discharge fan.
ICC IMC-2021 History
ICC IMC-2024
$58.00 $117.00
ICC IMC-2021
$48.00 $97.00
ICC IMC-2018
$44.00 $89.00
ICC IMC-2015
$44.00 $89.00
ICC IMC-2012
$40.00 $80.00
ICC IMC-2009
$38.00 $77.00
ICC NY-MC-2007
$35.00 $70.00
ICC IMC-2006
$39.00 $79.00
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