Compartment fire data with either no ventilation or forced overhead ventilation are successfully modeled as well-stirred fire environments rather than two-layer fire environments. The extinction of flames is predicted using the limiting oxygen index concept linked with a well-stirred model of the fire environment. While the fire environment in compartments with overhead ventilation is quite different than naturally-ventilated fires or fires ventilated from floor level, a temperature model previously developed by Beyler and Deal is shown to predict preflashover temperatures in forced ventilation fires.