Fire protection fastening device for fastening a door actuator

A fire protection fastening device for fastening a door actuator, the device comprising:

• a frame with a back side, configured to be facing a mounting surface, wherein a mounting axis is defined perpendicularly to the back side, and wherein the frame is formed for arrangement between a door actuator and the mounting surface or is an integral component of the door actuator,
• a reaction chamber formed in the frame, wherein the frame delimits the reaction chamber on the entire circumference, and wherein the reaction chamber is open on at least one of the back side and a front side of the frame opposite the back side,
• a drive element made from intumescent material disposed in the reaction chamber, which, when thermally activated, is formed for pushing away the door actuator from the mounting surface, and
• a piston plate disposed in the reaction chamber, which, when thermally activating the drive element, is displaceable by the drive element, in relation to at least one of the frame and the door actuator.