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Is my bathroom fan venting into unvented space between ceiling and flat roof??
My 1920s three story brick house has a 1950 one story bedroom/ bathroom addition. The addition has a flat rubber roof. The exterior brick toward the roof on the addition has no vents to vent the air above the finished ceiling inside and the flat roof. The bathroom ceiling powered fan vent draws lots of moist air out of the bathroom very effectively, but without visible vents on the brick exterior between the ceiling level and rubber roof level, all I can assume is that the moist air is simply getting dumped into the unvented space between the ceiling and roof. I'm in Pennsylvania, where we have very hot, humid summers and very cold winters. I've owned the house three years, and I see no evidence of condensed water damage on the ceiling of this addition, and when I walk on the roof membrane, I don't detect springy, wet wood structure beneath. I would expect that dumping all the highly humid bathroom shower exhaust air into the unvented space would create evident damage. The roof has three equal diameter plumbing vent stacks. Is it possible that the fan exhausts through one of them? I can't imagine that, since the stacks are straight pipe with open tops. I put my ear to the opening of each stack while the fan was running below and heard no fan sounds and felt no exhaust air. Any guesses on where this exhaust air is going? A real long shot guess is that the fan might exhaust through a duct that would take a long journey to the wall between the addition room and the kitchen and tie into the kitchen exhaust duct, but that is a long shot guess. Thoughts?