Gas Fitter Practice · Question
Which type of appliance requires a dedicated source of outdoor combustion air, separate from the indoor air, for safe operation?
A direct-vent appliance draws all combustion air from outdoors and expels flue gases outdoors through a sealed system, making it suitable for sealed rooms.
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Question: Which type of appliance requires a dedicated source of outdoor combustion air, separate from the indoor air, for safe operation?
Answer options:
- Category I furnace located in an open basement.
- Atmospheric water heater in a utility room. ✅ Direct-vent boiler in a sealed mechanical room.
- Power-vented furnace in a crawl space.
Correct answer: Direct-vent boiler in a sealed mechanical room.
Explanation: A direct-vent appliance draws all combustion air from outdoors and expels flue gases outdoors through a sealed system, making it suitable for sealed rooms.
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Question explanations
- What is the maximum allowed pressure for a propane system supplying a residential appliance?
- When installing a gas outdoor appliance, what is the minimum required clearance from an opening into a buildin
- Which code specifies the requirements for the installation of propane-burning appliances and equipment?
- What is the maximum allowed pressure drop for gas piping within a building, from the point of delivery to the
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