SoftRunFlux is a handy toolkit for fire and ventilation planning. It estimates heat reaching people during a fire so you can map safer exit routes. It checks how natural airflow and wind help or fight smoke movement. It flags the wind speed that could flip airflow direction. It helps pick the right damper cracking pressure to keep rooms within safe pressure. It gauges how much control a damper really has in a duct run and solves airflow leaks through shafts and gaps. It predicts how fast fans spin up and how much power they draw on start. It also compares soft-start and VFD options and checks VFD harmonics (THDi) to keep power quality in line.