A heat transfer device comprising: a heat exchanger comprising: a base; a center axis extending through the base such that the base extends outward from the center axis in a radial direction; and a plurality of fins connected to the base and defining a corresponding plurality of air flow channels supported on the base, wherein each of the plurality of air flow channels comprises: an inlet; and an outlet radially outward from the inlet relative the center axis, and wherein each of the plurality of air flow channels turns between the inlet and the outlet relative the center axis and the radial direction, and a blower connected to the heat exchanger and coaxial with the center axis, wherein an exit of the blower is fluidically connected to the inlet of each of the plurality of air flow channels characterized in that each of the plurality of air flow channels is a mixed flow channel with the inlet angled relative the center axis and the radial direction, and the outlet facing radially outward; and wherein the blower is a mixed flow fan such that the exit of the blower is angled relative the center axis and the radial direction. a heat exchanger comprising: a base; a center axis extending through the base such that the base extends outward from the center axis in a radial direction; and a plurality of fins connected to the base and defining a corresponding plurality of air flow channels supported on the base, wherein each of the plurality of air flow channels comprises: an inlet; and an outlet radially outward from the inlet relative the center axis, and wherein each of the plurality of air flow channels turns between the inlet and the outlet relative the center axis and the radial direction, and a base; a center axis extending through the base such that the base extends outward from the center axis in a radial direction; and a plurality of fins connected to the base and defining a corresponding plurality of air flow channels supported on the base, wherein each of the plurality of air flow channels comprises: an inlet; and an outlet radially outward from the inlet relative the center axis, and wherein each of the plurality of air flow channels turns between the inlet and the outlet relative the center axis and the radial direction, and an inlet; and an outlet radially outward from the inlet relative the center axis, and wherein each of the plurality of air flow channels turns between the inlet and the outlet relative the center axis and the radial direction, and a blower connected to the heat exchanger and coaxial with the center axis, wherein an exit of the blower is fluidically connected to the inlet of each of the plurality of air flow channels characterized in that each of the plurality of air flow channels is a mixed flow channel with the inlet angled relative the center axis and the radial direction, and the outlet facing radially outward; and wherein the blower is a mixed flow fan such that the exit of the blower is angled relative the center axis and the radial direction. mixed flow channel with the inlet angled relative the center axis and the radial direction, and the outlet facing radially outward; and wherein the blower is a mixed flow fan such that the exit of the blower is angled relative the center axis and the radial direction.