What is the maximum allowable concentration of carbon monoxide in flue gases of a furnace?

The maximum allowable concentration of carbon monoxide (CO) in the flue gases of a furnace is significant for safety and regulatory compliance. A concentration of 400 parts per million (PPM) is recognized as the limit within which flue gases should operate to minimize health risks and ensure safe operation. Levels beyond this can pose a serious risk of carbon monoxide poisoning, as this gas is colorless and odorless, making it particularly dangerous.

Regulatory standards are structured to protect both the occupants of the building and the environment, highlighting the importance of maintaining emissions within safe thresholds. A concentration of 400 PPM allows for a margin of safety to accommodate any variations in measurement while ensuring the system is functioning effectively without posing a health risk.

Understanding these limits is crucial for those working with gas and oil heating systems, as regular monitoring and maintenance can help prevent dangerous conditions and ensure compliance with safety standards.