What is the flammable range of CO?

The flammable range of carbon monoxide (CO) is correctly identified as between 12.5% and 74%. This range indicates the concentration levels of CO in air where combustion can occur if an ignition source is present. Below the lower limit of 12.5%, there is insufficient CO to maintain a flame, while above 74%, the mixture is too rich in CO for combustion to take place effectively.

Understanding the flammable range is crucial in fire safety and prevention because it helps responders determine conditions that could lead to fire hazards. Knowledge of these limits allows for better assessment of environments where CO may accumulate, aiding in the prevention of potential fire incidents and enhancing safety protocols during firefighting operations.