What is the purpose of measuring CO levels in combustion appliances?

Measuring carbon monoxide (CO) levels in combustion appliances is crucial for ensuring safe combustion air levels. CO is a colorless, odorless gas that can be produced during the burning of fossil fuels. When combustion appliances are not properly vented or adjusted, they can produce dangerous levels of CO, posing serious health risks to occupants. By monitoring CO levels, technicians can assess whether an appliance is operating safely and determine if there is an adequate supply of combustion air. Ensuring that combustion air levels are safe helps prevent incomplete combustion, which can lead to higher CO emissions and unsafe conditions within a space.

In contrast, other options, such as verifying fuel consumption, determining the age of the appliance, or assessing heat distribution, do not directly address the critical safety concerns related to carbon monoxide production and the importance of maintaining proper air levels for safe combustion. While those aspects may be important in other contexts, the priority when measuring CO levels is centered on ensuring the safety of the environment where the appliance operates.