Exhaust fan in bathroom

Hi all,

I need to put an exhaust fan in a bathroom. Only problem it is a lean-to (skillion) roof with only approx 100mm clearance or roof space to fut the fan box into. Most fans are at least 150mm main box size. The shower is at the lower end of the skillion roof and as such the hot air will be going across the room to the highest point about 2.5m away.

low>>>>>>>>>>>high
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|_X_______________|

the above diagram is where the shower (X) is located in relation to the room and the roof line. The roof slopes upward from the low to high end. Where would the best place be for an exhaust fan? It would be in the middle to the high end, but I am limited by roof space and the wall height is only 2m at the low end so cant put in wall above shower as it isnt high enough.

All suggestions/comments welcome and appreciated.


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