Illinois Plumbing Code Practice

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Prepare for the Illinois Plumbing Code Exam with comprehensive quizzes and tailored study materials. Test your knowledge with engaging questions and detailed explanations to boost your confidence and readiness for the exam!

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What is the minimum diameter required for the main vent stack for each building drain according to the Illinois Plumbing Code?

1 inch
2 inches
3 inches
4 inches

The correct answer is: 3 inches

The Illinois Plumbing Code mandates that the main vent stack for each building drain must have a minimum diameter of 3 inches. This sizing requirement is necessary to ensure proper ventilation and air circulation in the plumbing system, thereby preventing sewer gas build-up and maintaining the system's efficiency. Additionally, a larger diameter helps accommodate adequate airflow, reducing the chances of clogs and blockages in the vent stack.