In this paper an experimental study was carried out on forced draft cooing tower with expanded wire mesh (EWMP) packing. Air quality and performance of the tower was studied over the packing height. Due to complicated configuration of packing surface, it is not possible to measure the air temperature at the intermediate points of the packing height. In the present experimental study a new concept of psychrometric gun technique is used to measure dry/wet bulb temperature of air at intermediate points of tower packing. The paper elaborates the effect of L/G ratio on the thermodynamics properties of moist air inside the cooling tower and performance characteristics over the packing height. It has been concluded from this work that the minimum cold water temperature was attained at lower L/G ratio and the tower performance decreases with an increase in the L/G ratio. Experimental values were compared with the mathematical model. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.