There is no obvious outlet for the fan in the en suite. There is a flexible duct behind the fan but I cannot see where it goes. I will have to get a usb camera and feed it down. My worry is it that it could be venting into the ceiling void.
I did wonder about drilling a hole through the gable end but then it occurred to me that the soil stack is on that wall. Is there a recommended distance between soil stack and fan to prevent sewer smells entering through the ducting?