Implementing an Infrared Suppression (IRS) device is very beneficial in mitigating infrared emissions from ships or aircraft. The present study investigates the flow field of a modified IRS device equipped with an inner funnel. A twodimensional axisymmetric domain of the IRS device is analysed using the SST k-ω turbulence model on OpenFOAM, where the flow is considered incompressible. The study observes the influence of inner funnel offset and inner funnel height reduction on the flow field and exit temperature of the IRS device. The jet has a Reynolds number of 3×10⁵ and temperature of 839 K. A non-dimensional ratio is chosen for both inner funnel offset and height reduction. The pressure drop in the device for both cases is given along with the streamlines and temperature plots. As the inner funnel offset increases, the percentage drop in temperature increases, leading to a reduction in the device's exit temperature. In contrast, despite any inner funnel height reduction, the device's exit temperature remains unaffected.