Gas Fitter Practice · Question
According to CSA B149.1, what is the maximum permissible concentration of carbon monoxide (CO) in flue gases, diluted with combustion air, measured at the appliance vent collar for Category I appliances?
CSA B149.1 specifies maximum allowable CO levels to ensure safe operation. 200 ppm air-free is the limit for Category I appliances at the vent collar.
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Question: According to CSA B149.1, what is the maximum permissible concentration of carbon monoxide (CO) in flue gases, diluted with combustion air, measured at the appliance vent collar for Category I appliances?
Answer options:
- 400 ppm air-free ✅ 200 ppm air-free
- 50 ppm (as measured)
- 100 ppm (as measured)
Correct answer: 200 ppm air-free
Explanation: CSA B149.1 specifies maximum allowable CO levels to ensure safe operation. 200 ppm air-free is the limit for Category I appliances at the vent collar.
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