Theo- Almost all of those cheap surplus older style Gast rotary vane compressors are quite a bit noisier (2x-3x) than the newer model rotarys with the quiet running head. As Ted says, they are difficult to hear 50 ft away. My 0523 1/3hp GAST rotary sits in the garage that shares a common wall to my office-lab. I do not hear it when the compressor runs. I just checked it again and it is not louder in the office-lab than the computer CPU noise.
As Ted says, there will be no problem with overheating if the pump sits in an open enclosed area. Newer GAST rotary units with quiet running heads typically operate at 205F and have thermal shutdown at 256F.
I just measured the footprint of my 0523 with a four outlet manifold - 12"wide x 16" long. Manifold is turned so it extends back over the compressor to save a little extra space. Want a photo?
