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'Common sense' (I.e. guesswork) would suggest there would be triangular no-drill area beneath the beam, with the base of the triangle being the beam width. Anybody know if this is true, and what angles should be used?

Yup, done that. There is just a round attachment point, with butterfly valve, ready for ducting, at the top of the fan motor. As I said, this is 280mm below the boxing for the beam. All I need is a 90 degree trunking piece, and a straight section and I am through the wall and out. 100mm would be...

Thanks. Yes, I started to poke around then realised I'd have have to take off the cooker hood, then make a hole though the plasterboard (which appears to be attached using studs) before I could even see the wall. Messy. I would like to know what to look for, or if its even possible, before I...

We moved into a house with a cooker extractor hood set up to 'recirculate' which noisy, and ineffective. I would like to convert to external extraction, which, as its on an external wall, should be reasonably simple. However, the hood is mounted directly beneath a large supporting beam from...