customer has used the processing and assembly procedures specified in the classification report and technical documentation, observed the relevant Forster Profile Systems processing and assembly guidelines [...] curtain wall and/or curtain wall element, window, fixed glazing and doors. Should the production process deviate from that in the classification report and technical documentation, Forster Profilsysteme [...] documents does not replace professional consultation. Generally, the customer must ensure careful processing as well as compliance with the rules of engineering during the manufacture of curtain facades and/or