Gas Fitter Practice · Question
In a natural draft appliance, what causes the flue gases to rise through the vent system?
Natural draft relies on the principle that hot combustion gases are lighter than the surrounding cooler air, causing them to naturally rise.
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Question: In a natural draft appliance, what causes the flue gases to rise through the vent system?
Answer options:
- An exhaust fan
- The pressure differential created by a venturi ✅ The buoyancy of hot gases being less dense than ambient air
- A mechanical damper
Correct answer: The buoyancy of hot gases being less dense than ambient air
Explanation: Natural draft relies on the principle that hot combustion gases are lighter than the surrounding cooler air, causing them to naturally rise.
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