Gas Fitter Practice · Question
When installing a gas-fired water heater, what is the minimum required clearance from the top of the vent connector to combustible material?
CSA B149.1 specifies a minimum 3-inch (75 mm) clearance from a single-wall vent connector to combustible material horizontally and vertically.
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Question: When installing a gas-fired water heater, what is the minimum required clearance from the top of the vent connector to combustible material?
Answer options:
- 1 inch (25 mm) ✅ 3 inches (75 mm)
- 6 inches (150 mm)
- 12 inches (300 mm)
Correct answer: 3 inches (75 mm)
Explanation: CSA B149.1 specifies a minimum 3-inch (75 mm) clearance from a single-wall vent connector to combustible material horizontally and vertically.
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