If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an ______________ furnace?
Correct answer: B. Underfired
- A. Sidefired
- B. Underfired
- C. Covered
- D. Recirculating
Explanation
When combustion occurs below the hearth and the hot gases rise into the heating chamber, the furnace is underfired. Side-fired furnaces introduce the flame from the side rather than beneath the hearth.
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