| http://www.w3.org/ns/prov#value | - Copper is the best choice for a small air system that will not have a lot of cooling surface due to short runs of pipe, it is a safe material to use, is easy to install, has been used in countless systems for many many years with no reputation for failure (just the opposite actually) and unless it is exposed to some kind of abrasive or corrosive in the air flow it will last for generations!
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