Just wanted to make sure that you realize this is a 220v unit. This means you will need to use a double 20 amp. I would also suggest running 8/3 wire and a double 40 amp breaker. If it gets cold(below freezing) your compressor will draw a little more amperage to get started, also you never know when you are going to possibly purchase another piece of equipment that may require 220v. This way do it once and forget about it. As for running the wire thru the wall or using conduit I would check with your local building codes. Your home insurance and building inspector can get kinda sticky on these issues.
I would also use a recommend A plug receptacle. This allows you to switch out cords if you get an oven to do powder coating.
Just a thought
Mack
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