An apparatus for air cooling a module of a system that includes a rotating shaft extending through and beyond an end face of a housing of the module, the end face being substantially perpendicular to the rotating shaft and a side of the housing being substantially parallel to the rotating shaft, the apparatus comprising: a Coanda panel that can be mounted adjacent to the end face of the housing, the Coanda panel having a central opening through which the shaft can extend, an exterior Coanda surface of the Coanda panel having a central region that, when the Coanda panel is mounted adjacent to the end face of the housing, is radially perpendicular to the shaft and a periphery that curves smoothly from radial to axial, so that, when the Coanda panel is mounted adjacent to the end face of the housing, a rim of the Coanda surface is directed axially and is substantially aligned with the side of the housing; a fan assembly including a fan blade that can be mounted to the shaft proximal and exterior to the Coanda surface, the fan blade being smaller in diameter than the housing, the fan assembly being configured, when the fan blade is mounted to the shaft proximal and exterior to the Coanda surface, to direct a flow of air parallel and adjacent to the Coanda surface, so that the air is attached by the Coanda effect to the Coanda surface and is thereby redirected by the periphery of the Coanda surface, without relying on ductwork, to flow axially along the side of the housing, thus making use of the Coanda effect to redirect the airflow from radial to axial, and to maintain the airflow in close proximity to the housing; and a fan cover, the fan blade being located between the fan cover and the Coanda surface, wherein the fan cover is smaller in diameter than the Coanda surface and the housing. a Coanda panel that can be mounted adjacent to the end face of the housing, the Coanda panel having a central opening through which the shaft can extend, an exterior Coanda surface of the Coanda panel having a central region that, when the Coanda panel is mounted adjacent to the end face of the housing, is radially perpendicular to the shaft and a periphery that curves smoothly from radial to axial, so that, when the Coanda panel is mounted adjacent to the end face of the housing, a rim of the Coanda surface is directed axially and is substantially aligned with the side of the housing; a fan assembly including a fan blade that can be mounted to the shaft proximal and exterior to the Coanda surface, the fan blade being smaller in diameter than the housing, the fan assembly being configured, when the fan blade is mounted to the shaft proximal and exterior to the Coanda surface, to direct a flow of air parallel and adjacent to the Coanda surface, so that the air is attached by the Coanda effect to the Coanda surface and is thereby redirected by the periphery of the Coanda surface, without relying on ductwork, to flow axially along the side of the housing, thus making use of the Coanda effect to redirect the airflow from radial to axial, and to maintain the airflow in close proximity to the housing; and a fan cover, the fan blade being located between the fan cover and the Coanda surface, wherein the fan cover is smaller in diameter than the Coanda surface and the housing.