Airtightness requirements for fire doors
The national standard has clear requirements on the size of the gaps at the lap joints of fire doors: for steel fire doors, it is required that the overlap between the sash and the door frame should not be less than 10mm, and the gap between the sash and the door frame on both sides should not be greater than 4mm. After the fire door is installed and closed, the gap should not be too large, otherwise the airtight performance of the fire door will be difficult to guarantee, and it will be difficult to reflect its function of suppressing the spread of fire and smoke under fire conditions.
Therefore, the width of the gap in the installation of fire doors must be strictly controlled. Installation according to these standards can ensure the effective function of fire doors to a certain extent. Consumers must supervise when hiring construction units to prevent them from cutting corners and other problems, so as to prevent fire doors from occurring in the event of a fire. cause casualties.