A Virtual Reality experiment was conducted in the Fire Lab in the scope of a Bachelor thesis project. The experiment aimed to evaluate the effect of radiant heat flux in the perception of realism of the VR environment. Participants were exposed to a VR scenario in which smoke filled up a long corridor the participants were in. Radiant heat panels installed in the ceiling were controlled by a computer, which increased the heat flux as the smoke layer descended on the participant. The objective of this study was to improve the realism of the experience for the participant in VR smoke scenarios. The results are currently being analyzed and will be presented in a thesis that will be defended at the division in January.