I have an old double brick house with a flat roof. I want to vent my bathroom out the wall to avoid putting a hole in the new roof membrane. The problem is that the wall is not insulated leaving me about 2 inches of space between the inside brick and plaster (the plaster is furred out on 1x2s). Is there a skinny fan out there somewhere? I would prefer not to build the fan box out of the wall for aesthetics. When I talk to locals in the hardware stores they look at me like I am crazy, but every house is this entire city is double brick, flat roof, no insulation so someone has to have tried this.
thanks a lot.