| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent outdoor-side and indoor-side members of a heat insulation sash, which is provided in a door, from being separated from each other in the case of fire.SOLUTION: A fire door includes a fire door body that has an opening and that has front and back sides covered with a steel plate, an opening frame that is provided at an edge of the opening of the fire door body, and a reinforcement material for coupling the front-side and back-side steel plates together. The opening frame is configured by coupling inner and outer shape materials together by a coupling material with heat insulating properties, and the inner and outer shape materials of the opening frame are coupled to the reinforcement material.</p> |
