Oil-less rotary screw technology 15-110kW (20-147hp) Why Oil-Less? Contaminant Freeā¦ Risk Free Continued need for processes where absolutely no oil can be present. Growing need for alternative options due to increasing costs associated with lubricated compressors. Increase in environmentally conscious organizations demanding oil less air. When you choose an oil-less EnviroAire VS Series compressor from Gardner Denver, you get a clean reliable and efficient air supply that benefits both your business and your bottom line! Air purity is critical for many applications where even the smallest drop of oil can cause product spoilage or damage production equipment. For this reason, the EnviroAire VS Series compressors from Gardner Denver contain absolutely no oil anywhere in the compressor and have been certified ISO 8573-1 Class Zero (2010) and silicone free, making it the ultimate choice with simply no risk of oil contamination.