What is secondary air?

What is secondary air?

• A. Air that cools equipment
• B. Air externally supplied to the flame at a point of combustion
• C. Air that mixes gas before it hits the burner before combustion
• D. Outside air for combustion vertical

Answer: (B)

Secondary air is air supplied from outside the burner to the flame at the combustion zone to complete and stabilize the burning process. It is added after ignition, near the flame, to ensure there is enough oxygen in the flame region for full combustion and to maintain a stable, efficient burn. It isn’t air used to cool equipment, nor the air that mixes with gas before ignition, and it isn’t just general outside air for combustion. That precise role of delivering air into the flame at the point of combustion makes it the best description.

Secondary air is air supplied from outside the burner to the flame at the combustion zone to complete and stabilize the burning process. It is added after ignition, near the flame, to ensure there is enough oxygen in the flame region for full combustion and to maintain a stable, efficient burn. It isn’t air used to cool equipment, nor the air that mixes with gas before ignition, and it isn’t just general outside air for combustion. That precise role of delivering air into the flame at the point of combustion makes it the best description.