I have noticed that almost all bathroom fan I have seen go through the
attic. Here in eastern canada the attics are very cold in winter. Would it
not make more sense to route the ductwork in warm areas, as in down and out
to a vent such as a dryer uses? Or even straight out a side wall? I have
seen the attic of an apartment building with 10' of uninsulated rigid duct
work which was 95% full of solid ice. In the spring this ice melts and leaks
out of the duct work seam and then pool on the vapour barrier until it finds
its way to a seam and through the drywall ceiling.
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