Bathroom Exhaust Fan not sucking Air out:

Mr. Will.
by Mr. Will.
I tested the suction by using a Kleenex and the fan would not pull the Air out. Went up into Attic and the Exh. Vent was never vented out side. Bathroom Specialist. There's a 4" Exhaust vent going out Roof about 10' away, can I add the unvented Fan to the existing one or do I have to vent separately?
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