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ICC IMC-2018

2018 International Mechanical Code

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. For the most current adoptions details go to International Code Adoptions  Important changes include:  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.

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International Code Council [ICC]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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