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Hi Shaun - thanks mate. Even with secondary returns, etc - can the situation be rectified given part of the plumbing has been done in 22mm branching into 15mm? I don't want to rip it out as 4 of the rooms have been acoustically over-boarded and skimmed
How close could you get to the 22mm and what's he done t off the 22mm to each appliance with 15mm ??