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I mean just obnoxiously loud so we both had earplugs in. Unfortunately the co-worker was underneath the vehicle working near the AOST which is an air oil separator tank. Because the system operates again off of a crank-driven, crank belt driven compressor that looks just like a specific or a screw style. And it has roughly nine liters of oil in the system to lubricate the compressor. And it wants a 30 minute minimum run time, preferably 100 or an hour run time to preload and stress test the system to make sure that everything is working correctly. And yeah, I give it 45-46 minutes before I finally figure it out.