Extractor fan ventilation

[Tony 1]

Sorry if posted in wrong section, but couldn't find a suitable one to answer question. I'm thinking of getting a wall mounted extractor fan put in the bathroom but cannot vent out of the external wall due to limited access from the outside. I was thinking whether or not it could be ceiling mounted and vent into the eaves in the loft?

Is this suitable?

Thanks

 

[electronicsuk]

Trying to mount a standard axial fan in the ceiling and duct out is not a good idea. You see it a lot on new builds where the spark/builder either don't have a clue, or are cutting costs to the bone. The end result is that the extraction rate is very poor (these fans aren't designed to be connected to long duct runs), and water inevitably condenses in the duct and comes back down into the fan, leading to self destruction.

You want a centrifugal in-line fan mounted in the loft, such as these. Not only are they less obtrusive, they're quieter, give a better extraction rate, and may help avoid any notifiable electrical works in the bathroom.

Bear in mind that unless the ducting is well insulated, you can still get problems with vapour condensing in there and dripping back down into the bathroom below. Either use insulated ducting, or fit a condensation trap.