The Q4 Pro™ model turbine is powered by a high-performance, 4-stage double ball bearing, single speed, bypass motor that produces approximately 30% more power than the 3-stage systems (Q3™ & Super System). Four stage means that 4 fans are used to develop air propulsion. The Q4 Pro™ is ideal for painting contractors who generally spray latex house paint. Of-course the Q4 Pro™ can spray all other coatings equally well including lacquers, enamels, oil-based paints, water-based coatings, etc.