What is the purpose of a spoiler screw located on a burner or adjustable shutters?

The purpose of a spoiler screw located on a burner or adjustable shutters is to mix primary air and gas effectively. When tuning a burner, achieving the right mixture of air and gas is essential for optimal combustion. The spoiler screw helps adjust the airflow into the burner, ensuring that the correct amount of air is mixed with the gas before ignition. This adjustment is crucial for maintaining proper combustion efficiency, lowering emissions, and achieving a stable flame.

While the other options address different aspects of burner operation, they do not relate to the specific function of the spoiler screw. For example, increasing gas pressure involves other controls and adjustments within the gas system. Adjusting flame height is typically managed by different mechanisms, such as gas flow adjustments or burner settings. Monitoring combustion efficiency typically requires the use of combustion analyzers and does not involve a spoiler screw. Therefore, understanding the role of the spoiler screw in ensuring the right air-gas mixture is vital for effective burner performance and system efficiency.