How is primary air controlled?

Primary air is controlled by air shutters at the inlet of the burner. The role of primary air in combustion is critical, as it mixes with the fuel to achieve proper combustion efficiency. Air shutters allow for the adjustment of the amount of air entering the burner, which in turn influences the fuel-to-air ratio. This direct control through the shutters ensures that there is an optimal mix of air and fuel, facilitating efficient burning and reducing emissions.

Adjusting the fuel mixture independently does not directly control primary air; rather, it adjusts the overall combustion process. Temperature regulation is more related to managing the heat output or safety mechanisms rather than the air intake specifically. While a fan system can influence air movement and assist in combustion, it does not provide the same fine control over the primary air as air shutters do. The mechanism of air shutters at the inlet is essential for precise adjustments needed during operation to maintain efficiency and safety in gas appliances.