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Heat from burning fuel warms the walls of the firebox section of the furnace in

Aa hot-water heating system.
Ba hot-air heating system.
Ca compressor compartment.
Dan evaporation system.

Verified Answer :

Heat from burning fuel warms the walls of the firebox section of the furnace in


A. a hot-water heating system.

B. a hot-air heating system.

C. a compressor compartment.

D. an evaporation system.