In this type of cooling towers the air circulating through the natural draft. The atmospheric natural draft type cooling towers are consists of box shaped MS MDG supporting structure with FRP louvers. The louvers allow the atmospheric air to pass through the tower. in this type of cooling tower water from system is pumped to a Gl spray header provided at the top of a tower. it is sprayed down into the tower through the nozzles, since the heat transfer from water to air is dependent upon the surface of water exposed to the air stream, therefore, these cooling towers are supplied with a special type spray nozzles having finer spray pattern for good performance of the