Flue supports in void

[Ermintrude]

Open flue is 1.8m Max. Concentric is 1m

 

[arran197]

Flues must be supported at 1.8m or every change in direction before and after the bend. Unless the manufacturers instructions suggest otherwise.

Baxi for example, state that the flue must be supported at least every meter and before and after every change in direction, preferably supported on every section regardless of length. I fit them at every meter, depending on how rigid the flue actually is I may fit one on every section. Having said that, sometimes you physically can't get a clip on each section. In this case, there's not really much choice, you can't do the impossible.