Decided to free up a good amount of garage space by building a small outside building in the backyard just for the air compressor. This was already a fairly quiet compressor, but it's also nice not the hear it fire up if I'm out in the garage tinkering around late in the night. All the electrical is coming from a 50-amp breaker through a disconnect and into a 30-amp (compressor) and a 15-amp (outlet/cooling fans) branch circuits. It's all underground and the disconnect is in the garage on the wall. Ran the air above ground at the base of the house slab mostly through 3/4 copper with just a short piece of iron pipe. Never again will I use iron pipe, too many leaks and they are a ***** to fix. It's just a 2x4 framed building with a shingle roof and Hardie siding. All of the walls and the ceiling have fiberglass insulation and that is 3/4 MDF on the walls. I used two cheap bathroom vent fans out of the ceiling to cool the inside and the intake muffler is built into one of the walls. Both can draw fresh air in, but it is all baffled through a couple of chambers built into the walls. When the door is shut you can hear it, but it sounds about as loud as the air conditioner sitting right next to it. Super quiet compared to the way it used to be sitting in the garage.
