If the flame is produced under the hearth and then sweeps up into the heating ch

Question

If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an ______________ furnace?

Options:

A . Sidefired

B . Underfired

C . Covered

D . Recirculating

Answer: Option B
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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