In all furnace cabinet configurations, the return air:
A) Enters as combustion air, travels through the heat exchanger, and exits the fan end of the furnace.
B) And combustion air enter the furnace through the same opening.
C) Enters at the fan housing end and exits the heat exchanger end of the furnace.
D) Enters at the heat exchanger end and exits the fan housing end of the furnace.
C
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