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Hi there, cheers for the reply. The bathroom is on the ground floor, but has no external walls. I'm hoping to run 100mm ducting through the wall near the ceiling and into the roof space above the room next door which has a lower ceiling. The room next door is a single storey extension and has...

Hi there, i'm installing some extractor fans in my house and need to drill two 100mm or so holes in the wall from my bathroom into the roof space of my extension. To make it so that the ducting will come out above the ceiling in the extention I need to drill through the top of the wall in the...