What could be a symptom of defective venting systems?

The spilling of carbon monoxide (CO) from appliances is a clear symptom of defective venting systems. Proper venting is critical for the safe operation of gas appliances, as it ensures that combustion gases, including CO, are safely directed outside the home. If these gases are not vented properly due to obstructions, leaks, or mechanical failures, they can escape from the appliance and enter the living space, leading to serious health risks.

In a functional venting system, you would expect carbon monoxide to be effectively removed from the interior environment. Therefore, normal CO levels are not indicative of a problem, and effective clearing of gases points to proper functioning. Consistent pressure readings alone do not provide definitive evidence regarding the integrity of the venting system, as they do not reflect the potential presence of harmful gases within the home. When appliances spill CO, it signifies a failure in the venting system, highlighting the need for immediate inspection and remediation to ensure safety.