Gas Fitter Practice · Question
What is the acceptable method for terminating a Type B vent above a flat roof?
CSA B149.1 requires Type B vents to terminate at least 2 feet (600 mm) above any part of the building within a 10-foot (3 m) horizontal distance.
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Question: What is the acceptable method for terminating a Type B vent above a flat roof?
Answer options:
- At least 6 inches (150 mm) above the roof line
- At least 12 inches (300 mm) above the roof line
- At least 2 feet (600 mm) above the highest point where it passes through the roof ✅ At least 2 feet (600 mm) above any part of the building within 10 feet (3 m)
Correct answer: At least 2 feet (600 mm) above any part of the building within 10 feet (3 m)
Explanation: CSA B149.1 requires Type B vents to terminate at least 2 feet (600 mm) above any part of the building within a 10-foot (3 m) horizontal distance.
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