Fast opening door for internal compartment, intended for rooms with high transit frequencies, compliant with UNI EN 13241-1 law. Complete with upper crosspiece in galvanized sheet steel (not self-supporting) with uprights in galvanized steel, winding shaft, casing in galvanized sheet (as option also painted) side sliding guides equipped with self-centering system. Fireproof PVC covering, class 2. Possibility of inserting transparent fixed windows. Operation with automation with open-close button, optional: radio control, radar, magnetic loop.