The law requires that smoke and fire protection doors remain closed at all times. Doors which are intended to remain open for reasons of convenience are equipped with a blocking system. This guarantees that in the event of a fire, the section on fire is sealed off and smoke protection is ensured. The blocking system generally consists of at least one fire alarm, a trigger mechanism, a blocking mechanism and the necessary supply of energy.
Integrated systems based on door closers: The door is kept open by means of an electromechanical blocking mechanism in the sliding rail and can be opened to an angle of between 80 and 120 degrees. The doors can be closed by hand with ease. For double-leaf fire doors, the door closing sequence selector is integrated into the continuous sliding rail. The smoke detection panel is fitted in the sliding rail or on the other side of the lintel. Other external smoke alarms can be connected to the object if required.