Radfan Slim Radiator Fan 5 "Makes such a difference!" Mrs Peak 23 January 2019 We live in a 1920s house with a sub floor void and no wall insulation. With big rooms it gets a bit chilly. Having bought the smaller version for the kitchen I decided to invest in this one for one of the radiators in our large lounge. It has certainly helped take the edge off, especially with the current sub zero temperatures outside!