The 2006 International Mechanical Code presents a framework of minimum requirements for mechanical systems that control environmental conditions and related processes within buildings. Its stated purpose is to safeguard life, health, property, and public welfare through provisions governing design, construction, installation, materials, operation, and maintenance. The edition combines prescriptive rules with performance provisions and incorporates approved changes through the 2005 code development process. The contents move from administration and definitions to equipment placement, structural protection, service access, condensate disposal, and heating and cooling load calculations. Dedicated chapters address natural and mechanical ventilation, exhaust systems, duct construction, insulation, air filters, combustion air, chimneys, and vents. Further sections cover specific appliances, boilers, water heaters, pressure vessels, refrigeration, hydronic piping, fuel oil storage, and solar systems. Appendices concern combustion air openings, chimney connector passages, and recommended permit fees. The opening administrative provisions explain how the code applies to existing installations, alterations, repairs, changes of occupancy, historic buildings, and relocated structures. They also distinguish its scope from fuel gas requirements and certain residential construction requirements. A sample adoption ordinance shows how jurisdictions can incorporate the code and supply local information. Explanations of committee designations and marginal markings help readers identify responsibility for provisions and changes from the 2003 edition. Together, these features support systematic consultation by mechanical designers, contractors, inspectors, and officials.