Gas Fitter Practice · Question
When installing a gas appliance, what is the minimum required clearance from combustible materials for a single-wall metal vent connector?
CSA B149.1 generally requires a 150 mm (6 inch) clearance from combustible materials for single-wall metal vent connectors to prevent fire hazards. Reduced clea
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Question: When installing a gas appliance, what is the minimum required clearance from combustible materials for a single-wall metal vent connector?
Answer options:
- 25 mm (1 inch) ✅ 150 mm (6 inches)
- 300 mm (12 inches)
- Clearance varies based on appliance type and vent temperature
Correct answer: 150 mm (6 inches)
Explanation: CSA B149.1 generally requires a 150 mm (6 inch) clearance from combustible materials for single-wall metal vent connectors to prevent fire hazards. Reduced clearances may be allowed with proper shielding.
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