I have a bathroom extractor fan fitted on a SW facing wall which is letting a backdraught. Searching on here i need to fit an in line shutter.
Straightforward not quite? The fan ducts through a length of 4inch Osma. Can anyone recommend a suitable shutter or do in need replace the Osma with a length of flexible ducting?
Thanks
Straightforward not quite? The fan ducts through a length of 4inch Osma. Can anyone recommend a suitable shutter or do in need replace the Osma with a length of flexible ducting?
Thanks