Run about coil: comprises two or more multi-row finned tube coils connected to each other by a pumped pipework circuit. Thermal wheel or rotary heat exchanger: is made up of a circular honeycomb matrix of heat absorbing product, that's slowly rotated throughout the supply and exhaust air streams of the https://purethermal.co.uk/media-news/november-launch-waste-heat-recycling-design-support-service-from-pure-thermal-and-oilon/