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The following references are recommended to study for the Arizona L-4 Boilers, Steamfitting and Process Piping (Commercial) Exam. This examination is used to obtain a Arizona L-4 Boilers, Steamfitting and Process Piping (Commercial) License. Also to become a licensed contractor in Arizona, candidates will also need to pass a business and management exam.

Only the following references are permitted to be taken into the exam.

  • OSHA 1926
  • 2009 International Mechan…
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