These are bad to the bone. I have seen some like this in paper mills around the northwest. I used to work for a company called Sulzer Escher Wyss, probably a division of the same outfit.
My compressor is about 15 years old but just recently dropped into this spot. Rubber mounted and bolted to the floor makes it much quieter than it was in years past. Looking to add this soon... www.garage-pak.com and expand my air locations around the shop.
(fun to see everyone's AC's)
I purchased the BetterFoam pressure tanks / wand mixer kit for a couple big garage gable ends that needed to be sealed up a couple years back. It was awesome and covered more area than I thought it would. Just remember as torque1st says, the expansive qualities of any spray foam applications...