1st, the direct-current ventilator (not brushes static figure): May provide directs current 3V/5V/12V/18V/24V, the size by 25□×10mm to 360□×32mm, biggest air output by 0.11-150CFM, entire line altogether 40 models. 2, exchanges the ventilator: May provide various countries' peaceful gauge voltage, the size by 80□×25mm to 250□×90mm, the biggest air output by 20-600CFM, has 14 models on all fronts.