Motorized dampers for industrial air heaters must be verified to be in what position before main burner operation?

Motorized dampers for industrial air heaters must be verified to be in the full open position before main burner operation because this ensures that adequate airflow is allowed into the combustion zone. Proper airflow is crucial for maintaining the correct air-to-fuel ratio, which impacts combustion efficiency and safety. If the damper were closed or only partially open, it could lead to insufficient airflow, resulting in incomplete combustion, increased emissions, and potential overheating or damage to the heating system. Verifying that the damper is fully open helps ensure that the system operates smoothly and efficiently, optimizing performance and extending the life of the equipment.