Specifies requirements for the construction and installation of fire-resistant doorsets used to protect openings in walls and partitions, which are required to resist the passage of fire. .Applies to transom panels over 0.5 h fire-rated doors, where the panels are contained within the door frame and form part of the doorset. A panel above a doorset, which is not contained within the door frame, is considered as being part of the wall and is therefore subject to the stability, integrity and insulation requirements set out in accordance with applicable statutory and regulatory requirements. A transom within a door frame may be permanently fixed to the side members of the frame or may be removable by means of mechanical fixing.Does not apply to lift-landing doors.Does not cover materials for floor coverings that extend through a fire-resistant doorset opening.