Ingersoll Rand's rotary screw air compressors include the 5 hp to 15 hp, the 15 hp to 50 hp and Nirvana variable-speed drive 7.5 hp to 40 hp models. Nirvana rotary screw compressors are enhanced by the IntelliDrive integrated variable-speed drive power system which offers unmatched scalability. A simple firmware upgrade enables shops to add to their air capacity without having to upgrade to a new compressor, allowing the Nirvana compressor to grow along with a shop's business. All the compressors are built around reliable, low-speed airends and motors that deliver more air for less horsepower, cutting energy costs and extending compressor lifespan. Smart integration eliminates leaks and pressure drops, maximizing reliability. A shaft-mounted centrifugal fan blower reduces power consumption and noise, simplifies ductwork, improves cooling and requires no maintenance.