I think this is the most suitable forum for this post but, please point out if I'm wrong.
Some background info: We've had an extension built, but the kitchen has not been moved. Also there is a utility room next to the kitchen, and therefore the shortest route for the extractor ducting is horizontally to the utility room and then out through it's pitched roof (roughly 23 deg).
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!