I have 1200 sq/ft of infloor tubing ( hepex 1/2" O2 barrier) in my shop. 150' of 1.25" thermopex will supply the shop from a tarm in the attached house garage. A plate exchanger will be at the boiler or somewhere in the basement prior to where the thermopex will transit to the shop. Glycol will be in the shop loop. The probem is I also ran a set of 1" dura pex in the shop ceiling to another room in the shop. I just realized that Dura pex is not O2 barrier. I had the lines spray foamed in place. The lines are run for a possible water to air exchanger in the future room. I dont want to add another exchanger/pump. Does anyone have any comments on the proper plumbing (exchanger location, pumps,pump size for transit,pump location) for this scenario? Should I just forget about the non barrier or redo it with O2 barrier?