The closing sequence controller determines the closing order of the two door leaves: The corridor leaf, which is to close last, pushes against the pin of its support angle on the spring-loaded telescopic arm of the closing sequence controller and remains in this position until the stand leaf, when closing, comes into contact with the telescopic arm of the closing sequence controller with its follower pin and folds the telescopic arm flat against the door frame. This releases the corridor leaf, allowing it to close completely. Tested according to DIN EN 1158. It is installed concealed in the door head or behind the door frame and is also suitable for combinations of wide and narrow door leaves. Note: When used on fire doors, the use of a follower flap is mandatory! Version: Size 2: 650 mm for leaf widths up to 800 mm. Material: Galvanized steel. Installation type: concealed. Type: SR 392. Brand: Dormakaba. Contents: 1.