The Vostermans Ventilation Multifan Vplus fiberglass cone fan is a 54 inch, 3-blade, efficient and variable speed fan that offers substantial energy savings. It features a permanent magnet motor to help lower energy consumption. Over-ventilation is avoided by the ability to control the fans, and the total number of fans is reduced by the high air performance. The fan is mechanically compatible and interchangeable with current fan designs. Materials are resistant against corrosive climates. A soft start preents current spikes.