I have seen the tiny fan in a plastic tube from Dragons Den ti increase airflow from central heating radiator but not impressed, does anyone know of one that would fit below a double panel radiator to blow air up between 2 panels through the centre fins to increase circulation. I thought one of cylendric type fans in a box that could take air in at bottom and blow through radiator would be great, simple to fit and not cost a lot. Anyone heard of such a thing?