Ex council flat, solid floors. Using the duct which goes straight, down the middle, might be a way to make piping wet CH it up easier.
Anyone had problems? Don't line the ducts with steel do they?
They will either be steel straight sides or a corrugated slinky. The junctions may be a long way from the actual outlets.
Expect a few problems with horizontal ductwork, usually in the wrong place for radiators. Every time we've looked at doing it, the grief outweighs the advantages.
I take it you have considered a new HiSpec or Economaire WAU with System ET?
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