LUV Systems, Inc. was invited to present the methodology and thinking behind the design of the halō™ at the 17th international IA2022 conference in Kuopio, Finland. We also spoke about how these both evolved over the last two years based upon an indoor air cross-infection model and tool that we developed to quantify the time it takes to the build-up of an infectious dose of virus or bacteria in a room under various room conditions and using different mitigation strategies.