Description They are typically lighter, quieter, and more portable compared to their oil-lubricated counterparts. Oil-less compressors are commonly used in industries such as medical and dental as they deliver clean, oil-free compressed air, which is essential for sensitive applications. Input Voltage: 220V / 60 Hz Air Delivery: 4.8CFM @ 40 PSI Working Pressure: 85-115 PSI Tank Capacity: 30 Liters Speed: 1800 RPM.