WindMax Fans is new large HVLS energry-saving industrial fan based on PMSM (permanent magnet synchronous motor) principle developed by WindMax. With 220N.m torque, the driving force is more stronger and the torque is more stable.86% motor efficiency,IE4 high efficiency. The fan diameter from 2.5M to 7.3M,14850m�³/min air volume, free maintain for life, no need to change oil and seal. 20-years reliable life, WindMax Fans series solves the problem of ventilation and cooling in large spaces with better performance, lower energy consumption and longer life.