Where should CO be tested?

Testing for carbon monoxide (CO) is vital to ensure safety in all combustion appliances. The correct answer indicates that CO should be tested in all combustion appliances under worst-case and normal draft conditions. This comprehensive approach is crucial because CO can be produced by any appliance that involves combustion, regardless of whether it is vented or unvented.

Conducting tests under both worst-case and normal draft conditions helps identify potential issues that may not be apparent during regular operation. For example, worst-case conditions simulate situations where airflow is restricted, which can lead to hazardous levels of CO. Therefore, testing in both conditions provides a thorough assessment of the appliance's safety.

By assessing all combustion appliances, including heating systems, water heaters, and cooking appliances, we ensure that any risks associated with CO exposure are addressed, regardless of the type of appliance or its design. Proper CO testing is an essential part of maintaining safety standards in any environment where combustion appliances are present.