Ensuring Safety, Efficiency, and Innovation in Building Systems:

The 2021 International Mechanical Code (IMC) establishes minimum regulations for designing, installing, and operating mechanical systems in buildings. Focused on public health, safety, and energy efficiency, it sets broad-based principles while allowing for the adoption of new materials, methods, and designs.

Key Features:

• Prescriptive and Performance-Based Approach: Offers flexible compliance options while maintaining safety standards.
• Widely Adopted: Used by jurisdictions across the US and internationally.
• Comprehensive Scope: Covers diverse aspects of mechanical systems, including HVAC, plumbing (excluding sanitary drainage), fuel gas, medical gas, exhaust, refrigeration, boilers, furnaces, and energy efficiency.
• Regular Updates: Reflects advancements in technology and best practices.
• Clear Structure: Divided into chapters for easy navigation.

2021 Edition Highlights:

• Enhanced Fire Safety:
  • Clothes dryer exhaust terminals must be at least 3 feet from building openings.
  • Specific smoke and flame index limits for polyurethane spray-applied foam on exterior ducts.
  • Improved fire and smoke damper inspection requirements.
• Energy Efficiency:
  • 30% reduction in minimum mechanical ventilation for whole-house balanced ventilation systems.
  • Updated refrigerant tables to include new refrigerants.
• Other Notable Changes:
  • Approved factory-built combination intake/exhaust terminations allowed, relaxing separation requirements.
  • Continuous operation requirement for manicure and pedicure station exhaust systems.
  • Grease duct horizontal cleanout required within 3 feet of a horizontal discharge fan.
  • Addition of condensate termination identification markings and discharge restrictions.

Benefits for Various Stakeholders:

• Mechanical Professionals: Ensures compliance and guides safe installations.
• Inspectors: Provides benchmarks for evaluating projects and upholding standards.
• Architects and Engineers: Facilitates integrating mechanical systems into building plans.
• Building Owners and Operators: Promotes safer, more efficient, and sustainable buildings.