Illinois Plumbing Code Practice

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Prepare for the Illinois Plumbing Code Exam with our comprehensive quiz that includes flashcards and multiple-choice questions to bolster your understanding of plumbing standards and regulations. Gear up for your test!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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.