This paper discusses fire induced smoke movement and associated species transport in a multi-enclosure compartment building. A set of steady state and transient state fires experiments have been conducted in a full-scale building. The distributions of various physical parameters such as temperature, velocity and species concentration, were measured, Particular attention is given to the flow fields at the doorway which connects the room of fire origin and a corridor. The experimental results indicated the effects of mixing between the hot upper layer smoke and the relatively cool lower layer air in the corridor. Some data processing techniques are also explained.