Abstract: A fire door plays an important role in preventing fire expansion in case of a fire outbreak in a protection area. This study is different from previous studies, introducing unprecedented fire door. If an existing fire door is exposed to heat for several hours, it has a difficulty shutting off flame, heat, toxic fumes, being deformed. However, the newly introduced fire door with an insulation and flame interruption performance structure can shut off toxic fumes and heat effectively providing water into a fire door doorframe and the inside of the fire door and expanding water inflating agent at the same time. Also, despite of being exposed to heat for many hours, the fire door is not deformed as certain temperature of a fire door is maintained by pressurized water of the inside of the fire door.