Fire doors typically have a solid core made of varying materials and are typically thicker than standard doors. Fire doors are constructed differently depending on the manufacturer. However, its certification and testing to withstand fire for at least 30 minutes is crucial. At an approved fire door testing centre, manufacturers are required to test the design of their fire doors and frames together. After that, they need to be looked at for certification. A label will be attached to each fire door set produced by that manufacturer in accordance with the same design specifications once certification is granted. The manufacturer, manufacturing date, and fire rating are all listed on the label. Most of the time, you’ll find this label on the door’s top edge.