A new heat recovery unit was supplied for the existing roof top plant room. The unit comprised of electric frost heating, filtration, plate heat exchanger, heating and cooling coils, and direct driven EC fans. The unit was specifically designed around the existing ductwork connections and all connections were located in unorthodox positions. The unit was supplied in flat pack and reassembled on site by our site team. All works were carried out in the evening to limit disruption to the day to day operations of the station.