Looking at a quick job for a family member, bathroom lighting needs replacing as it energy inefficent hallogen and the fittings are going all corroded and manky, existing is 12V with individual transformers on a dimming pullcord. So fittings will come out and get replaced with 240v dimmable LED ones, simple enough, but one of them is one of those fan/light kits you used to get where a light is mounted in the middle of a 4" vent, with a tiny inline fan above. Does anyone make a 100mm vent with a dimmable LED fitting at its centre?