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The only way to make a quiet compressor would make it really slow.
At one of my former offices we had air ported to lots of places in the building. The compressor was in a back room up in the ceiling, hanging from four rods on spring mounts. The ceiling tile panel made it pretty quiet. We put in a high quality oil field grade stainless steel ball valve in the bottom of the tank. Just kill the compressor and and turn the handle and drain the tank. It worked great for 25 years. Changing the oil on the compressor was a pain, but not horrible. If you were in that room you could hear it but having a conversation was not a problem.
It was an expensive and complex solution, but it worked great. The easy choice is put the compressor outside.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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