From German electric onroad brand MXLR comes this Fan Booster.  Housed in a lightweight alloy case and weighing 4.5 grams, this small device transforms the 6V of your receiver to 8V output, which will increase the speed of your fan and by this the cooling ability.  This leads to less fading, more consistency and by this more speed over run time.  Measuring 24,20mm long / 13,20mm wide / 6,2mm high, to install simply connect the Fan Booster via the JR Servo Plug with your receiver, plug your Fan into the booster.