Plumber Red Seal · Question
A vent pipe must be increased to a minimum of what size before it passes through the roof?
Vent pipes passing through a roof are typically increased to a minimum of 3 inches (75 mm) or sometimes 4 inches (100 mm), depending on the local code and clima
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: A vent pipe must be increased to a minimum of what size before it passes through the roof?
Answer options:
- 2 inches (50 mm)
- 3 inches (75 mm) ✅ 4 inches (100 mm)
- The size of the largest soil or waste stack it serves
Correct answer: 4 inches (100 mm)
Explanation: Vent pipes passing through a roof are typically increased to a minimum of 3 inches (75 mm) or sometimes 4 inches (100 mm), depending on the local code and climate, to minimize the risk of frost closure at the termination point.
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
More about Plumber Red Seal
Related Questions
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
- A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Ex
- A plumber is designing the domestic hot water recirculation system for a multi-story residential building. Wha
More for Plumber Red Seal candidates
Practice tests
Question explanations
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Plumber Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.