Gas Fitter Practice · Question
What is the maximum permissible percentage of carbon monoxide (CO) in the undiluted flue gas of an appliance at steady state?
CSA B149.1 sets a maximum limit of 0.04% (400 ppm) CO in the undiluted flue gas of an appliance at steady state conditions.
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Question: What is the maximum permissible percentage of carbon monoxide (CO) in the undiluted flue gas of an appliance at steady state?
Answer options:
- 0.02% ✅ 0.04%
- 0.08%
- 0.10%
Correct answer: 0.04%
Explanation: CSA B149.1 sets a maximum limit of 0.04% (400 ppm) CO in the undiluted flue gas of an appliance at steady state conditions.
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