A mobile smoke control and fire protection device for buildings is provided. The device comprises a sealing unit that can be applied to, or inside, an opening of a wall, a ceiling or a floor, is adapted to the opening in terms of the shape and size thereof, and is provided with at least one passage for people and/or at least one passage for tools, firefighting equipment, and the like. The passage for people and/or the passage for equipment can be least partially covered.