This study analyzes the appropriate ventilation rate within the housing of the power generating facility of the fuel cell. Appropriate ventilation can prevent an explosion in the event of hydrogen leakage by controlling the leakage before it reaches the explosion threshold. In this study, the criteria for adequate ventilation were established by calculating the amount of hydrogen leaked according to the leakage hole size. Based on these criteria, the ventilation rate that would keep the amount of gas below the explosion threshold was calculated. Using this appropriate ventilation rate, equipment that has the capability of releasing hydrogen within the fuel cell power generating facilities was selected, and the amount and rate of leakage were calculated based on a specific leakage scenario. The minimum ventilation rate in terms of spatial volume that is required to prevent explosions for the 45 m(3) space examined in this research was confirmed to be above 30%, and this rate should be applied when designing ventilation systems. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.