The fire door in the corridor can be always opened unless it is equipped with a normally open fire door device, and it can be connected to the fire center to meet fire standards. If this device is not available, the fire safety standard fire doors must be normally closed and should not be kept open.
The national standard has clear requirements for the size of the gaps at the overlaps of fire doors: For steel fire doors, the overlap between the fan and the door frame must not be less than 10mm, and the gap between the two sides of the fan and the door frame must not be greater than 4mm. After the fire door is installed and closed, the gap cannot be too large, otherwise the sealing performance of the fire door cannot be guaranteed, and it is difficult to reflect its effect of suppressing fire and smoke spread under fire conditions.
Therefore, the width of the seam of fire door installation must be strictly controlled. Installation according to these standards can guarantee the effective function of fire doors to a certain extent. Consumers must supervise when hiring construction units to prevent problems such as cutting corners and cutting materials, so that fire doors will not be exposed to fires. Causes casualties.