for concealed installation in the vertical door rebate von Innentüren Features and advantages: Concealed installation ‚¬â€œ no fittings in the way. Neat appearance of the door ‚¬â€œ the door closer is "invisible". All functions adjustable from the front: ‚¬â€œ Closing force ‚¬â€œ Closing speed (stepless) ‚¬â€œ Latching force from approx. 7° Colour coded adjustment valves: ‚¬â€œ Closing speed ‚¬â€œ red valve ‚¬â€œ Latching force ‚¬â€œ yellow valve Plastic valves with optimum thermal characteristics provide consistent closing speed also with changes in temperature. Application: Universally applicable on all door types including arched doors (round, segmental, lancet). For timber, PVC and aluminium doors. Suitable for flush and rebated doors. Suitable for DIN lh and rh doors. Technical description: Maximum door leaf widths: ‚¬â€œ FTS 20: 1100 mm ‚¬â€œ FTS 24: 1250 mm High closing pressure in closed position. Easy opening of the door due to decreasing opening resistance. High efficiency due to needle bearing in the pivots. Safety valve in the door closer. Vertical installation below the top door hinge. Anodised aluminium body, linkage arm galvanised steel.