1. Introduction
It is important to understand the air flow rate through the openings during fires in fire safety engineering. The minimum
flashover heat release rate (HRR) in a room fire can be estimated based on the air flow rate [1]. The ventilation factor plays
an important role in estimating the air intake rate [2].
CFD has been widely applied in hazard assessment in applying performance-based design (PBD) for providing fire
safety performance for projects with difficulties to comply with the codes. The CFD software FDS is commonly used to
study fire driven fluid flow. The Navier-Stokes equations were derived to study low-speed, thermally-driven flow with an
emphasis on smoke and heat transport from fires [3]. In this paper, FDS version 5 was applied to investigate the air flow rate
through the door opening induced by an ISO9705 room fire. Results were used to evaluate FDS model in predicting HRR in
boundary analysis.