I ran 40 feel of galvanized pipe on my wall with a short flexible hose hooked to my compressor. It has a down tube and a ball drain at both ends. It zigzags up the wall to the ceiling and then straight down to a drain. This gives the hot air a chance to drop its moisture as it cools. All parts of the pipe are angled to let water drain to one side or the other.

Another piece of galvanized pipe jogs up at the final down leg about mid-pipe and goes into a water separator. Its never even gotten one drop of water in it after 7 years, because the galvanized pipe dries the air and the collected water falls down to both ends of the drains.

I found the idea for this on Google.