🔍 Key Concepts

• Burner location in relation to the furnace front and windbox • Purpose of the areas marked by arrows F, K, and L in a water‑tube boiler • Difference between gas path outlets (uptake/stack) and fuel admission points (burners)

💭 Think About

• On the illustration, which arrow is closest to the opening where fuel and air would actually enter the furnace space? • Do arrows F, K, or L appear to point at an air/fuel register or do they point at headers, drums, or gas‑outlet structures? • If none of these arrows clearly indicate a burner throat or register, what does that suggest about the answer choices?

✅ Before You Answer

• Identify on the drawing where the furnace front and burner register are located (look near the bottom front of the furnace). • Confirm whether arrow F is associated with the uptake/stack or damper, not the burner. • Check whether arrows K and L point to water/steam circulation components rather than a fuel nozzle or burner opening.