Red Seal Plumbing Practice Exam

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What is the minimum size of a building drain?

  1. 2" (50mm)

  2. 3" (75mm)

  3. 4" (100mm)

  4. 5" (125mm)

The correct answer is: 3" (75mm)

The minimum size of a building drain is typically a 3" (75mm) diameter. This is because it ensures proper flow and drainage of waste and water from the building. Option A (2") is too small and may cause clogging and backups. Option C (4") and Option D (5") are larger than necessary and may result in higher construction costs. Therefore, the most practical and efficient choice is B (3"). Remember to always follow local building codes and regulations to determine the appropriate size for your specific project.

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