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CYOA

Also trying to pick up some 150mm duct to feed out from my extractor today - manrose ok as a brand?

edit: the brand I was looking at all have comments both in the kit version and the standalone ducting saying that the pipe is actually 160mm+ and won't fit in a 152mm hole. Thoughts? The kit version can be crunched down to size but risks damage, the standalone version is much tougher and can't easily be shrunk:

https://www.screwfix.com/p/manrose-aluminium-laminated-flexible-ducting-hose-silver-10m-x-152mm/86676
https://www.screwfix.com/p/manrose-extractor-fan-wall-fixing-kit-150mm/12523

Where should I look for proper 150mm ducting?

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Nef in reply to @CYOA

You can get a saw guide for pull saws.
https://www.workshopheaven.com/z-saw-japanese-free-angle-saw-guide-set.html
I have a much cheaper version but I can't seem to find it online.
If you have a circular saw, just clamp a straight bit of wood to whatever you're cutting to use as a guide, or buy a dedicated clamp guide. You just need to measure the offset of the blade from the edge of the base, so you know where exactly to clamp the wood/guide.
https://www.machinemart.co.uk/p/clarke-cht684-50-clamp-guide/

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CYOA in reply to @Nef

Thanks - want to do it today really so I suspect a bit of straight wood is the best bet. Maybe use a square and screw a second piece running perpendicular so it can sit on the edge of the workpiece? Will experiment this morning.

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