Gas Fitter Practice · Question
What is the acceptable range for carbon dioxide (CO2) in the flue gas of a properly tuned natural gas appliance?
A CO2 reading of 8-10% in flue gas indicates efficient and relatively complete combustion for natural gas appliances.
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Question: What is the acceptable range for carbon dioxide (CO2) in the flue gas of a properly tuned natural gas appliance?
Answer options:
- 2-4%
- 5-7% ✅ 8-10%
- 11-13%
Correct answer: 8-10%
Explanation: A CO2 reading of 8-10% in flue gas indicates efficient and relatively complete combustion for natural gas appliances.
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- 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?
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