Sliding arm FD494 Free-swing angle adjustable up to 180°. Closing force size EN 3-4. Doors up to 1100 mm wide. Specifications Type of product Mechanical guide rail Mounting position Door leaf Single leaf Hold open function No Close Mounting plate DC117Angle mounting plate for double door fire door closing systems. Opening damper FD115Opening damper Mounting set FD113Mounting set for wide doors.