Building sliding door system with fire protection

A building sliding door system for separating a first building region from a second building region, the building sliding door system comprising:

• a frame structure having a passage region and a wall shell region;
• a sliding door displaceable in the frame structure between a closed position and an open position, wherein the wall shell region at least partially accommodates the sliding door when in the open position;
• a drive unit and a control device connected to control the displacement of the sliding door between the closed position and the open position;
• and
• a fire protection unit having a bracket mounted to the frame structure and a fire protection device movably mounted on the bracket, the fire protection device being formed of a material with a predetermined fire resistance, wherein the fire protection device is displaceable horizontally within the wall shell region between a retracted position when the sliding door is in the open position, and an extended position when the sliding door is in the closed position, wherein the fire protection device forms a fire-protection surface at least equal to a vertical area in the wall shell region for receiving the sliding door.