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I'm assuming that by "down draft furnace" you mean a counterflow or downflow furnace. This furnace takes its "cold air return" at the top, and blows the warm air out the bottom (typically, into ductwork that runs under the floor).
Older downflow furnaces were dedicated to that configuration, and could not be mounted in other positions.
Nowadays, most furnace manufacturers make "multi-poise" furnaces. They can be mounted in downflow, upflow, or side-flow positions, when they are installed according to the manufacturer's certified instructions.
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