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I am installing radiant tube in a staple up system with aluminum panels and i wanted to have all equal (8) 250' loops with 1/2" tubing per floor, however due to beams that can not be drilled and also some of the layout criteria dictates that some of my loops will be in excess of the 250' desired maximun lenght. What are the downfalls of exceeding 250', maybe 2 loops that weill be 285'+/-.