What is the function of primary and secondary air register?

Primary and secondary air registers are crucial components in combustion systems, such as in furnaces or boilers. The primary air register controls the amount of air mixed with fuel before combustion, ensuring efficient burning and minimizing emissions. The secondary air register introduces additional air into the combustion zone to enhance the combustion process, promote complete burning of the fuel, and reduce pollutants. Together, they optimize combustion efficiency and improve overall system performance.