That's how it stands currently, the red pairs of lines are the current ducting - he decided to duct to the side of the house, I am proposing switching to the front, but joists might make it as sensible to go to the same side. Rated to IPX4. Easy installation and maintenance with the fan assembly easily removed from rigid ducting installations using the specially designed construction Genuine Manrose branded product. High quality ball bearing, long life motor, continuously rated and warranted for a minimum of 30,000 hours or 3 years

We have a small bathroom, big standard 1930's one, so do you think the 100T when ducted properly should be sufficient? He put the vent in the middle of the bathroom, instead of above the shower, and has placed the fan a decent distance away from the actual vent hole in the ceiling, and then ducted to the side of the house - he's also used (to much) flexible ducting........ hope you don't mind me resurrecting an old thread, but I have an MF100T that has just stopped working. Fan performance is generally quoted with the fan mounted in free space, with no ducting. The performance degrades rapidly as restrictions to flow are added, the worst thing being the stretchy 4” duct. Not only does it have not much area, but all those ribs create turbulence that further restricts the effective area. And the grills are often restrictive too, especially after a few years of use when the insect grills in them will be clogged up with fluff.The Manrose MF100Sis a powerful inline extractor fan which is ductable up to 12m. An inline fan is installed in the loft or ceiling void above the bathroom (or kitchen etc). Ducting is attached to each end of the fan with one length going to an internal grille in the ceiling of the bathroom and the other going to a grille on the external wall, soffit or roof. The Manrose 4 inch inline fanprovides a high extraction rate whilst keeping noise to a minimum. The mixed flow created by the twin blades enables the fan to pull more air than a conventional extractor fan making it ideal for use in bathrooms and other areas of high humidity. Had already had an idea to slope the ducting down and out of the house, so pleased to see that is mentioned above. watts power consumption (low / mid / high speeds). 50 / 60 / 68 litres per second / 180 / 216 / 245 cubic metres per hour extraction rate (low / mid / high speeds)

High quality ball bearing, long life motors, continuously rate and warranted for a minimum of 30,000 hours or 3 years.

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I would say that a fan rated somewhere around 200m3 per hour is probably sufficient provided it’s installed in a way that means it can get somewhere close to that in use. The easiest way to achieve that is to make the ducts and grills bigger. But don’t go too large as then the air speed will be very low and this could lead to condensation on “dead spots” for example on bends. Easy installation and maintenance with the fan assembly easily removed from rigid ducting installations using the specially designed construction Mixflo fans can be mounted in a variety of applications as shown and are suitable for use with either rigid or flexible ducting Total distance should be radically reduced anyway, and there should be no turns apart from necessary ones, into the fan and out of the house, although I am thinking to mitigate at least the one out of the house by just using a 45 degree elbow, and then cutting the pipe going out at an angle to give a flat exit if that makes sense. With regards to joining the ducting, is duct tape sufficient, or should I be looking at some kind of adhesive for a better longer lasting fit?