The Ruck 250mm ETAMASTER EC Inline Mixed Flow Fan EM 250 EC K 01 is a high-efficiency diagonal fan designed for dependable ventilation applications. It incorporates optimally tuned, CFD-optimized aerodynamics and a durable housing made of impact-resistant, reinforced polypropylene. The fan is equipped with a high-efficiency IE5 EC motor that is steplessly controllable and includes a potentiometer for connection in the terminal box. It provides consistent and efficient airflow and has been a benchmark for efficiency since 2012.