Bathroom extractor ducting

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Hello all,

I need to add an extractor fan to a bathroom and am unsure how to go about it.

The extractor fan will be located above a shower cubicle which is around 4 metres from the nearest window. The bathroom is on the first floor and above it is a loft space. My initial plan was to run some ducting directly up through the loft and then out of the pitch roof using a vent title. However, the roof is quite old (slate) and I fear that adding a vent could cause some disruption and a lot of extra work. I was wondering if it would be possible to run the ducting above the celling (along the loft space) and then back down into the room just before exiting through the external wall, this final part could be enclosed in a cupboard so it wouldn't be seen from inside the room.

Would this provide sufficient ventilation or would the bend in the ducting act as a damp trap? I'll also be honest in saying that I would much prefer to drill through the wall vs trying to fit a roof vent..

Thanks,
 
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Check the ducted efficiency of the fan. That will be equivalent to at least a 7m run.

Fitting a terminal in a slate roof is not as difficult as you think, and would be better than your other idea.
 
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Check the ducted efficiency of the fan. That will be equivalent to at least a 7m run.

Fitting a terminal in a slate roof is not as difficult as you think, and would be better than your other idea.
@ Woody. If you were building ground floor bathroom extension, and could choose wall or roof outlet, which would it be. I'm weighing up the risk of leaks into my 17 degree slope versus having the fan about 1.5M from shower.
 
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Nothing wrong with a roof outlet. It won't leak if fitted properly.

Always put the fan in the optimum location, if there are no other factors preventing it.
 

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