This comprehensive yet concise publication provides a convenient reference for regulations in the 2003 International Mechanical Code (IMC). The IMC addresses the design and installation of mechanical systems through the established regulations and requirements that emphasize performances. Provisions are provided for ventilation, exhaust systems, duct systems, combustion air as well as chimneys, boilers/water heaters, refrigeration, hydronic heating, and more. The code provides comprehensive minimum regulations for mechanical systems using prescriptive and performance-related provisions. The 2003 International Mechanical Code Commentary includes the full text of the Code, in addition to notes and explanations of the Code regulations and implications. This in-depth publication focuses on providing the full meaning and implications of the 2003 IMC and is designed to suggest the most effective method of application, as well as the consequences of not adhering to the code. This is a comprehensive reference for code officials, engineers, architects, inspectors, plans examiners, contractors and anyone who needs a better understanding of the 2003 IMC.