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go on have agigle if you like but i need a new length of twin wall flue but do i measure the inside or outside for the flue size

I am about to buy a copper cylinder for my farm house I am going for an indirect cylinder 1200x450 but just as i had found the best price i noticed some of the cylinders had s r (secondary return ) written in the description can anyone tell me what the difference is please and which one do i...