Crack the Illinois Plumbing Code Exam 2025 – Dive into Your Future with Confidence!

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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

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.

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4 inches

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