The International Mechanical Code (IMC) establishes minimum requirements for the design, installation, and maintenance of mechanical systems through both prescriptive and performance-based provisions. Built on broad-based principles, the IMC encourages innovation by allowing the use of modern materials, advanced construction methods, and evolving design practices while ensuring safety and reliability.

Notable updates include:

• Expanded provisions addressing pollution control units.
• A new exception recognizing Type I kitchen hoods listed for combustible clearances of less than 18 inches.
• Added requirements and guidance for phenolic duct systems, a newer type of non-metallic ductwork.
• New provisions covering High-Volume Large-Diameter (HVLD), also known as High-Volume Low-Speed (HVLS), fans.
• Revised duct sealing requirements that relax sealing standards for Snap-Lock and Button-Lock duct joints and seams located within the building’s thermal envelope.

These updates reflect current industry technologies and practices, making the IMC an essential resource for engineers, contractors, inspectors, architects, and code officials involved in mechanical system design and compliance.