In a word, yes.
That will stink up the house.
Plus it is inefficient, as you are creating positive pressure within your walls and the fan will not be able to push as much air.
stinkyattic Reviewed by stinkyattic on . Anyone ever vent to drywall? I have the roof near my exhuast vent, has anyone vented into the wall? does it end up getting back into the AC stinking the house? Rating: 5