Conceived for industrial requirements, they are now the ideal solution for rapid and continuous transit of persons and vehicles. This type of door considerably reduces heat or cold loss, contributes to soundproofing between one area and another and occupies little space thanks to its vertical movement. Its excellent resistance to strong winds means that it can even be located externally. It is the perfect answer for factories, storehouses, warehouses, hospitals, commercial centres, distribution chains and for any other circumstance where separate compartments are required to safeguard the specific characteristics of each environment. Each door can be supplied with an electrical counterbalancing mechanism so that in case of a power failure it opens and can be used as an emergency exit.