The fas97 abus extension window fixes the hinge side. you have to fix the handle side separately. locking is automatic and the additional fuse does not need to be switched off manually. when opening the window, the fas97 only rotates, only the folding bracket must be pushed to the side before tilting the window. will mold hinge side protection mounted on window sash and frame. due to automatic locking when the window is closed, the fuse is always in place. to fix the hinge side slim construction, even for tight installation conditions convenient operation due to simple in and out snapping, no key required pressure resistance to the arms is over 1 ton Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.