Blast waves can cause serious injuries. Hence, significant research effort has been dedicated toward developing better and secure bunkers. Here, we investigate bunker design technique using the wire mesh. So, it is pertinent to study blast wave attenuation and mitigation. In laboratory settings, blast waves can be generated using shock tube. In the present study, shock waves are made to come out of the shock tube and collide with a wire mesh placed outside the shock tube. The shock attenuation happening on the wire mesh of different configurations for different Mach numbers and thereof variation in the flow are to be clearly understood. The study in this paper involves the finding of flow behavior across a rectangular sized wire mesh for a particular Mach number. Particle image velocimetry (PIV) is used for flow visualization and velocity and vorticity field are studied thereby. It is found that the strength of the shock wave is considerably reduced after passing through the wire mesh.