hi muppetatwork - how did you proceed? When I read your post I thought it was mine!! I have exactly the same issue in exactly the same bathroom. Last night I spent some time discussing my problem with chatgpt. I worked out that my 4 inch (100mm) extractor fan is nowhere near enough to clear the room. Like you I then started looking at inline solutions and came to the same question as you - i.e. boxing the fan on an external wall. I'm tempted to re-core to six inch because the performance jumpp is massive. I'm pretty confident that it will stop, or at least hugely reduce, the humidity. When I have a shower (I'm a five min max kind guy) I can see it hanging in the air. Chatgpt said the bigger inline units are used in gyms etc to clear the humidity. I reckon it will work for me.
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Bathroom fan - inline fan fitted outside on external wall in a sealed box
- Thread starter Muppetatwork
- Start date
If decide to go that route, you can get extract fans that mount on the outside. Google “external extractor fan”
This sort of thing:-
Monsoon Cased External Centrifugal Fan - National Ventilation
www.nationalventilation.co.uk
Just seen the date.
Yes, but @Dugbert was asking the OP how he solved the problem..
Yes, but I wrote the same as I did previously. 
Yes I think it only actually says a suitable means of ventilation is required but not 100% certain.
Which 'rule' requires it 'to be there to use?' Since this room has two outside walls, it seems quite probable that it has at least one window.
... and, of course, it's the same as you describe with windows - even if there is one, no-one can be forced to ever open iut
You are correct.
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