ETRI [ ETRI ] - ETRI has long been a leader in the design of air-moving devices, from large industrial fans to miniature flat axial fans. AC Fans - Today, ETRI's AC air movers are cooling and protecting the most sophisticated of electronic packages, and our basic commitment to uncompromising quality and high performance standards continues.DC Fans ETRI's DC fans offer the design engineer a wide range of design options to meet your specific application need. Various voltages, speeds, bearing systems, and termination configurations provide the engineer the