Installation第 43 / 110 题
A furnace installed in an upflow configuration discharges heated air in which direction?
a.Downward through the bottom
b.Upward through the top of the cabinet
c.Horizontally to the side
d.Directly outdoors
解析
An upflow furnace pulls return air in at the bottom and discharges heated supply air out the top, typical for basement or closet installations with overhead ductwork. Downflow and horizontal furnaces are oriented for other duct arrangements. The airflow direction must match the duct layout.
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