jordhandson
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you don’t want any flex pipe either as that massively reduces duct velocity. should be proper ducting.
if you have to make a transition it should be gentle sweeping bends
sharp changes in direction and flex ducting will cause dust to settle out and build up, reducing extraction performance.
plus flex ducting won’t last long at all due to the coarse abrasive nature of the dust
the Regs require these sorts of e traction system to be tested and inspected 6 monthly as it’s well know the dust eats away the extraction ducting
Ah this is the stuff I use. 150mm