Powerful 12 volt fan measuring 120mm x 120mm complete with short cables,this 12 volt fan can be used with a 12v battery,a 12v powersupply or directly from a solar panel,these 12 volt fans will work with panels of 6v 250mah and above but if you want optimum performance they work best with 12volt panels with an output of at least 200mah,in other words,12 volt panels of 4 watts and above,great for ventilation in greenhouses,conservatories etc,Max air Movement,approx 60cfm,price includes vat and delivery.