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Thanks - how does this work exactly? I can't fit the ducting through the hole. So ducting from extractor to hole, into connector, then what, some other piping through the hole (I saw some hard PVC one in B&Q which is 150 external), then out to the exterior grill? Seems odd that the standard coring bit in that size range (152mm) isn't big enough to fit the standard size ducting ("150"/160)
And is there a better brand to look for? As I'm not in the 'get it today' rush I'm happy to order something from somewhere if it comes within a week or so - I saw this for example which seems more solid than the cheapo plastic thing that came with the Manrose kit - is there much benefit? https://www.toolstation.com/stainless-steel-bull-nose-vent-grill/p87963
CYOA-
Ah. I was imagining you having issues fitting it onto a fan spigot. Not through a bored hole.
The rigid 150mm od from B&Q that you mention above should take the flexi duct over the end of it, from the fan. You'll probably have to get slightly creative to join onto the outlet grill which will have a 150mm spigot.
user69121
Your ducting ^^^ would be 150mm internal. Slip it over a connector which would give you 150mm external.
https://www.screwfix.com/p/manrose-round-connector-white-150mm/145gy