CSLB Class B General Contractor's License Practice Exam

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Prepare for the CSLB Class B General Contractor's License Test with interactive flashcards and multiple choice questions. Each question offers hints and explanations to enhance your understanding and readiness for the exam.

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What is the purpose of the 2-10 rule in chimney installation?

To regulate gas line pressure
To encourage proper draft and exhaust
To ensure structural integrity
To determine flue type

The correct answer is: To encourage proper draft and exhaust

The 2-10 rule in chimney installation is specifically designed to encourage proper draft and exhaust, ensuring that combustion gases are effectively vented outside the building. This rule states that for every two feet of vertical chimney or flue height, there should be at least ten feet of clearance from any obstruction, such as trees or nearby structures. This guideline is crucial because obstructions can significantly impact the flow of exhaust gases, hindering the chimney's ability to create a strong draft. A good draft is essential for efficient combustion and to prevent dangerous backdrafts, which could allow harmful gases to enter living spaces. By following the 2-10 rule, installers ensure that chimneys function optimally, minimize the risk of flue gas escape, and enhance the overall safety and performance of the system. Other choices, such as regulating gas line pressure, ensuring structural integrity, and determining flue type, do not directly relate to the primary purpose of the 2-10 rule, which focuses specifically on maintaining an effective chimney draft.