If you have a copper pipe touching metal duct work you could eventually wear little pits or holes in the pipe. Regardless of whether or not the pipe is gas, or water (although electrolysis would happen faster if it is water).
All you need is a strip of duct tape to separate these 2 dis-similar metals are you have nothing to worry about.
But if you really want to go the extra mile, insulate the pipe with armour-flex (sp?)
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