Why did the development of 80 percent efficient furnaces using draft-inducer fans present a problem for venting tables?
A) The draft-inducer fans required the use of a larger vent.
B) The inducer fan cooled the air, and a smaller vent was required to prevent condensation.
C) The fan heated the air too much for standard venting.
D) The use of natural-draft and draft-induced furnaces had little impact on venting tables.
B
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