In a typical coal-fired power station boiler the ignition and the combustion are largely controlled by burner aerodynamics, hence the geometry of the burner and the jet velocity ratio play an important role in achieving stable combustion, high burnout of fuel, low production of pollutants and control of fouling. Slotburners are used in tangentially fired brown coal boilers in Victoria. To obtain a better understanding of the overall combustion process, it is important to investigate the aerodynamics of the jet development from these burners. The aim of this paper is to investigate a rectangular slot burner in the presence of cross flow for jet velocity ratios of 1.0 and 3.0. A simple burner has been considered for investigation where the jets discharge at an angle of 60° to the wall. The burner consists of three rectangular slots vertically aligned with the centre known as primary nozzle and the top and bottom ones known as secondary nozzles. The velocity ratio (f) is defined as the ratio of secondary to primary jet velocity. Laser Doppler Anemometry experiments have been carried out at CSIRO Minerals. In the presence of cross flow, both primary and secondary jets deviated significantly from the geometric axis towards the wall.