This paper outlines several recent applications at ANSYS on simulations of fire and HVAC using ANSYS CFX, and focuses on three: 1. Web-enabled CFD for HVAC and fire. 2. IFC interface. 3. Backdraft simulation. A limitation of space means that the material cannot be detailed. However, the paper provides a flavour of significant progress at ANSYS in the HVAC and safety spheres.