Tight closing ____ may be installed with approved automatic draft and combustion controls.

Tight closing dampers are integral components in various heating systems, as they effectively regulate airflow to maintain optimal combustion efficiency. When installed with approved automatic draft and combustion controls, tight closing dampers help modulate the air entering the combustion chamber, which enhances fuel efficiency and reduces emissions. This system allows for better control over the heating process, ensuring that the right amount of air is provided for combustion based on the operational demands.

In contexts involving oil burning and combustion, the role of dampers is crucial in preventing excessive drafts when the burner is off, thus ensuring that the combustion process remains stable and efficient. This type of installation not only aids in the safe operation of the burner but also supports compliance with regulations regarding air quality and energy efficiency.

Other components listed, such as valves, fans, and filters, play different roles within the heating system. For example, valves control the flow of oil to the burner and are essential for safety and operational control. Fans assist in the movement of air for combustion but do not serve the same purpose as dampers in regulating and controlling air flow when the burner is not in operation. Filters, while important for ensuring clean fuel supply to the burner, do not have a direct role in draft and combustion control. Thus, tight