Abstract
In most ordinary builldings, steel doors are usually used as the fire proof doors to prevent fire spread in the buildings. However, in place of the steel doors, it is now being planned to use a kind of fire preventing zones which is composed of two doors with large glass panes and fire resistant area between the two glass doors for the convenience of fire extinguish activities, occupants' evacuation and prevention of smoke spread. This paper presents a theory and a calculation method of the thermal radiation heat transfer through the fire preventing zone. And the results of the sample calculations based on the theory show that it is practically possible for the zone to prevent the thermal radiation heat transfer caused by fire more effectively than fire proof steel doors of Class A, provided that the zone is appropriately designed.
