Gas Fitter Practice · Question
In a direct-vent gas appliance, how is combustion air supplied and flue gas expelled?
Direct-vent systems are sealed from the living space, drawing all combustion air from outside and expelling all flue gases outside through a coaxial or two-pipe
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Question: In a direct-vent gas appliance, how is combustion air supplied and flue gas expelled?
Answer options:
- Combustion air comes from indoors, flue gas vents to outdoors. ✅ Both combustion air and flue gas are taken from and expelled to outdoors through a sealed system.
- Combustion air is drawn from outdoors, flue gas is discharged indoors.
- Both combustion air and flue gas are drawn from and expelled to indoors.
Correct answer: Both combustion air and flue gas are taken from and expelled to outdoors through a sealed system.
Explanation: Direct-vent systems are sealed from the living space, drawing all combustion air from outside and expelling all flue gases outside through a coaxial or two-pipe vent system, enhancing safety and efficiency.
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