Gas Fitter Practice · Question
When is a draft hood required on a gas-fired appliance under CSA B149.1?
Draft hoods are specifically designed for Category I appliances to protect against downdrafts and ensure proper combustion air flow.
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Question: When is a draft hood required on a gas-fired appliance under CSA B149.1?
Answer options: ✅ For all Category I appliances
- For forced draft appliances
- When the appliance is installed in a mechanical room with power ventilation
- Never, modern appliances use induced draft fans
Correct answer: For all Category I appliances
Explanation: Draft hoods are specifically designed for Category I appliances to protect against downdrafts and ensure proper combustion air flow.
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