This video explains how FilterX leveraged CFD analysis and SOLIDWORKS Flow Simulation to optimise an air purification device originally conceived during the Covid pandemic. The team faced challenges in measuring airflow and residence time using basic equipment, prompting the need for advanced modelling. CFD enabled accurate tracking of particle behaviour, validating kill zones for LED-based sterilisation and achieving 95% correlation with physical tests. The discussion covers why outsourcing CFD was chosen over in-house training, highlights collaboration with Solid Solutions, and explores future plans for sensor integration, app-based monitoring, and Alexa connectivity to improve air quality management.