Manufacturer Part: 812
For skylights like Facro and Velux, this mounting set will usually be needed in order to mount the window opener correctly, i.e. where the hinge/pivot point is less than 40 cm. from where the opener is mounted.
For some skylights you will likely also need item no. 813 – Mounting Set B.
812 will also be required for standard type windows if the distance from the hinge to the opposite side of the window frame — where the opener is mounted — is less than 40 cm.