The portable smoke blocker made of special heat-resistant fabric can be quickly installed in a door or an entrance opening. The door to the area affected by the fire can now be opened and the fire fighters can enter the room behind without smoke and heat spreading in the building. The escape routes for the residents and the retreat ways for the fire fighters remain smoke-free. It is possible for the security backup to stay closer to the attacking fire fighters. The time for the rescue operation in case of a breathing protection emergency is considerable reduced.