I have five bathroom extractor fans in the house, three of them huge Manrose box units that must be 15 years old, and all are looking mucky and/or making unpleasant noises. Any recommendations on what to look for in a replacement? With a round of re-decoration coming up I'm inclined to replace the lot. They are all ceiling-mounted and ducted, mainly to vents set into the tiled roof.
Chris R