Saving energy is becoming an ever increasingly important topic these days. Especially when it comes to air-conditioning and ventilation technology, great potential savings can be achieved by using energy efficient fans. For this reason, motor and fan specialist ebm-papst has recognised the issue, and has developed a complete series of dual-inlet, direct-driven cylindrical rotor fans with efficient GreenTech EC technology. Without changing the design of the unit, this allows a conversion from a conventional fan with asynchronous motor to modern energy-saving technology.