Materials: Nylon, ABS, Aluminium Weight: about 105 g Rotor: 6-bladed, glass filled nylon Input power: 200-1000 W Max. rpm: 35.000 rpm Kit contents: complete, English instructions Assembly time: about five minutes Ageom: 49,4cm2 Aeff: 45,6 cm2 Static thrust: 7-22 N The standard for 90 mm ducted fans! Our Midi Fan follows the same design philosophy, that has already made the Mini Fan 480 a world wide success. It replaces both the Eco Fan II (EJT 540 unit) and Eco Fan pro (EJT cobalt unit). The Midi Fan stands for: - maximum static thrust - high efficiency at all speeds - optimised sucking capability even in extreme ductings The fan can be driven by a simple 540 can motor on seven cells, or by brushless motors running on more than 20 cells. Depending on the motor used, static thrust in excess of 700 grams can be achieved at 200 W input only, but the fan can be run on up to 1000 W input delivering 20 N of thrust and more. The fan unit comes nearly ready to use, just the rotor and motor need to be mounted. If you still have one of the old Eco Fan II/pro or EJT 540/cobalt unit, you can easily upgrade them by replacing rotor and prop adaptor. In the past it could happen, that the spinner cap failed at high power levels. Therefor we developed a new spinner cap, which we ship since Mai 2003. If you happen to have one of the old cap, please contact us and we will be glad to supply a new one free of charge.