Set deliberately, cut delicately — the window opening as part of the façade design. If the focus is to be on the formal aesthetics, only the glass area remains visible. This effect is achieved by the window frame being covered by the brickwork. The KF 400 and KF 405 windows of the studio design line can be rendered on three sides. Of particular interest is the fact that with a fixed glazing that is installed without a frame, such as the fixed element of the HS 330 timber/aluminium lift and slide door, the glass can be replaced easily in the event of damage.