As part of a bathroom refit I want to install a Zone 1 rated extractor fan. There is a convenient hole in the wall out to an existing airbrick. If I install the extractor fan into this exisiting hole how would I attach it to the inside of the airbrick to ensure that the condensation doesn't just drip down inside the cavity? Or would I have to knock out the airbrick (which would prove awkward (if not impossible!) as I'm on the first floor)?
Thanks
Thanks