How is the exhaust vented

The ACiQ AQ-GR9S800403AX is an 80% AFUE furnace that vents outdoors using Category I metal flue piping (Type B double-wall vent or single-wall metal connector) through the roof rather than PVC pipe. Its induced-draft blower routes exhaust vertically out of the top or rotated side flue outlet—depending on whether it's installed in an upflow or horizontal orientation—and it can't be vented horizontally through an exterior wall or used as a sealed direct-vent unit.

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