The 2006 International Mechanical Code establishes minimum regulations for mechanical systems using prescriptive and performance-related provisions. Topics covered include ventilation; exhaust systems; duct systems; combustion air; chimneys and vents; specific appliances, fireplaces and solid-fuel-burning equipment; boilers, water heaters and pressure vessels; refrigeration; hydronic piping; fuel oil piping and storage; solar systems; and more.

Important changes to the 2006 International Mechanical Code include:

• Air velocity in a grease duct serving a Type I hood reduced from 1,500 feet per minute to 500 feet per minute.
• New Section 507.2.1.1 requires exhaust hoods to automatically operate during cooking operations in commercial kitchens by means of an electrical interlock or heat sensors or other approved means.
• A change to 403.2.1 relaxes the absolute ban on recirculation of air from locker rooms, bathrooms, and swimming pools. Now, up to 10% of the supply air stream is allowed to consist of air exhausted from such spaces.

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