This paper reports experimental measurements on the diffusion of confluent jets thatform a wall jet. The experiments were carried out at a fixed air flow rate and fixed temperaturedifference between the supply and room air in the cooling mode. Based on these experiments, theresults presented show the behaviour of the wall confluent jet in the form of velocity profiles, thespreading ratio of jet on the wall, etc. The empirical equations derived are compared with othertypes of air jets, such as the free confluent jet, free plane wall jet, and free plane jet. It isconcluded that the wall confluent jet has a better self preservation characteristics than othertypes of air jets. The flow field of the wall confluent jet is classified into three regions: Free jetregion, Coanda effect region, Wall jet region.