Recent advances in fire science and computer modeling of fires allow scientists to predict fire growth and spread through buildings and other structures. In this paper we describe a variety of visualizations of simulated room fires for use by both fire protection engineers and fire suppression personnel. We also introduce the concept of fuzzy visualization, which results from the superposition of data from several separate simulations into a single visualization. 1 Introduction Controlling and managing fire has been a challenge for mankind throughout the ages. In modern times the emphasis on fire control has focused on understanding and predicting the growth and spread of fires. This has manifested itself in a modern thrust towards performance instead of prescriptive building codes [1, 2]. A key element in this change has been the recent development and availability of computer based fire simulation models. There are two basic types of models in use today, zone and field models. Zone ...