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Originally Posted by andrew_wallasey
This is a really daft question but how do they shape the big green ducting or is it flexible?
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The ducts come in 4m straight lengths which slot together. There is a bit of flexibility, but not much so there are a selection of bends which are used (90°, 45°, 22° & 11°) Normally, though, a chamber in the road/footway is used to negotiate sharper bends.