... Free cooling unit, free air, Free cooling box, free air, free cooling unit FUNCTIONFCB-03D is a compact free air cooler, specifically ... life..STANDARD FEATURES CabinetFCB-03D is a compact free air cooler complete with filter, digital controller and energy effective fan ... filterStepless fan speed controlPossible control of one or two active cooling units( 10A limit )Communication RS 232LCD Display with ...