Hi, >> Does anyone know of a slim, compact, but powerful 4" duct diameter extractor fan that will draw well along a 7 metre long duct in a very small room? << The cloakroom is just 7cu metre volume. I have a 7mtr long duct run in 4" smooth PVC soil pipe. I want to lose the current old, unsightly, but very efficient Vent Axia surface mounted fan; a massive box, hanging 5"/125mm into this tiny room. But it works very well considering the challenge of such a long duct run I prefer the modern compact slimline type where most of the fan is within the duct, only a thin grill/vent showing. I have a ceiling void above the room, beneath the landing above with fitted carpet. I have considered an in-line fan hidden there, but would prefer the whole thing accessible from the cloakroom. Looking at alternatives I struggle to find one with the muscle to draw the air along that long 7mtr duct - that either doesn't protrude into the room or isn't an inline one hidden where it would be difficult to get to if there was a problem. I have looked at the TLC range of Soler & Palau - TD - Mixed Flow Duct Fans - TD 160 which will draw 9metres. But these are in-line mixed flow, bulky and expensive. And, I'm not sure if I can get access to the duct run other than from the cloakroom. Does anyone know of a slimline fan that will do the job? Grateful for any help to resolve this.