(1) To separate the lobby of the fire lift from that of the scissor staircase by fire wall, and provide smoke prevention measures according to the related national standards No room should be permitted to have doors open to the staircase so as to prevent smoke from spreading to the staircase. (2) Natural lighting and smoke exhaust facilities should be provided in the staircase; (3) Lobby and transfer passageway should be finished with noncombustibles, no combustibles and other articles that may not guarantee the safe evacuation of the occupants should be permitted in the lobby and the transfer passageway; (4) If the lobby can’t be provided with natural lighting and natural smoke exhaust, emergency lighting and evacuation indicating signs should be installed, especially in the transfer passageway