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How much longer do you expect the run to be? Does the heating cooling adequate in those areas now? If not, now is the time to tweak it. I do not use flex lines but would think you can just hose clamp them on to the fittings. Once inside the building envelope slight leak is not a big deal, different when in uninsulated area. With pipe to fittings just use a couple of duct screws to secure, you can also use sealant if you really want it air tight.
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