Ventsim products are underground mine ventilation simulation packages designed to simulate airflows, pressure, heat and refrigeration, finanials, radon, fire (and many other types of ventilation data) from a model of airways. Ventsim was the first ventilation package to integrate an easy to use Windows graphical design with a 3D graphics interface.  The software is currently used by over 1000 mines, universities, consultants and research organisations throughout the world