Efectis (formerly TNO) has tested this newly developed fire-resistant overhead door and has assigned the NEN-EN 1634-1:2008 (NEN 6069) and also the classification NEN-EN 13501-2 to Protec for this innovative overhead door. This overhead door has even brilliantly achieved the classification El1-60, the highest thermal insulation requirement. If desired, the fi re-resistant overhead door can be designe with an integrated liquid-retention barrier, without this being detrimental to the fi re resistance.