Headbox installation very much depends on the installation scenario but will fit into one of the following categories. Face or reveal fixed- fixing straight through the headbox into the structure. When the fire curtain is revealed fixed, the fixings go through the top of the headbox and the side of the end plates if possible. When the fire curtain is face fixed, the fixings go through the back of the headbox and end plate flange. I beam fixing  If a suspended system is required, the client must install a self-supporting structure capable of taking the weight of the fire curtain, such as a steel beam, which is fire protected to the same or above the fire specification as the fire curtain. The fire curtain can then be attached directly to the steel beam.