According to ANSI standards, flue gases should contain less than how many ppm of carbon monoxide?

The standard for acceptable levels of carbon monoxide in flue gases is set to ensure safety and efficiency in combustion systems. According to ANSI (American National Standards Institute) standards, flue gases should contain less than 50 parts per million (ppm) of carbon monoxide. This limit is important because elevated levels of carbon monoxide can indicate incomplete combustion, which not only reduces energy efficiency but also poses significant safety hazards, including the risk of poisoning.

Maintaining carbon monoxide levels below this threshold helps ensure that gas appliances operate safely and effectively, as excessive CO can lead to harmful indoor air quality and potential health risks for occupants. This aligns with best practices in ensuring safe and effective operation of gas appliances and heating systems.