Bathroom in top flat of shared building (2nd floor - 1970's build) needs ventilation.
Bathroom has no access to any outside walls but has 500mm x 500mm double glassed window on the ceiling of flat roof.
Need to let any condensation escape via the window or any other means via bathroom. Not sure if an extractor fan on the flat window would work (possible letting water in?) or dome wth vents or any other suggested mechanism/installation.
