When can too much draft over the fire occur in a combustion system?

Too much draft over the fire in a combustion system can occur when the draft regulator is sealed shut. In such a scenario, the absence of an appropriately functioning draft regulator prevents it from normalizing the airflow within the heating system. A draft regulator is designed to maintain the correct balance of air intake to achieve optimal combustion conditions. When sealed shut, it disrupts this balance, leading to excessive air being drawn into the combustion chamber. This situation can cause combustion to become too vigorous and inefficient, possibly leading to problems such as overheating or incomplete combustion.

Understanding this mechanism highlights the importance of maintaining draft regulators and ensuring they operate correctly. Properly functioning draft regulators help regulate airflow, promoting efficient combustion and maintaining safety in heating systems.