What is the hottest section of the furnace?

A) Damper
B) Radiant tubes
C) Firebox
D) Refractory


Answer: C
Explanation: A) Incorrect. The purpose of the damper is to regulate the flow of air or draft in the furnace.
B) Incorrect. Radiant tubes are tubes located in the firebox that receive heat primarily through radiant heat transfer from the burners.
C) Correct. The firebox is the combustion area. It is the hottest section of the furnace.
D) Incorrect. The refractory lining, sometimes called fire brick, is a bricklike form of insulation used inside high temperature applications.

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