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I took down the rest of the sheetrock ceiling in my basement. having a much better view of my mains i just now realized that I have a single pipe, counterflow system with dry/wet returns on each riser? Is this possible? At first it looked like all the mains were angled away from the returns, but now that i can see the whole picture, the mains are angled back toward the boiler while all the risers have returns tided to the bottom.</span>