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.

• Added coverage of pollution control units.
• A new exception was added to recognize Type I kitchen hoods listed for clearances to combustibles of less than 18 inches.
• Added coverage for a newer type of non-metallic duct, phenolic duct.
• New coverage for high volume large diameter fans (HVLD), also referred to as high volume low speed (HVLS) fans.
• Relaxed requirements for sealing of duct joints and seams for Snap- and Button-lock duct joints located within the thermal envelope.