A ventilation box for providing ventilation between an interior of a room and an exterior of a room, the ventilation box comprising: - an outer casing ; - a main partition , which is arranged in the outer casing to separate an exchange compartment and a transition compartment from the ventilation box , said exchange and transition compartments being arranged inside the outer casing ; - external openings , carried by the external casing , each external opening being capable of alternately receiving an air spigot , to fluidly connect the transition compartment and an exterior of the ventilation box , and a blocking member , to close off the external opening ; - a main internal opening , carried by the main partition for fluidly connecting the exchange compartment and the transition compartment ; and - an exchange opening , carried by the outer casing , configured to fluidly connect the exchange compartment and the interior of the room ; characterised in that the ventilation box further comprises a blocking system , which changes between: - a passing configuration, wherein the blocking system allows a fluid exchange between each external opening not shut off by a blocking member and the exchange compartment , via the main internal opening ; and - a blocking configuration, wherein the blocking system prevents a fluid exchange between each external opening not shut off by a blocking member and the exchange compartment , via the main internal opening . - an outer casing ; - a main partition , which is arranged in the outer casing to separate an exchange compartment and a transition compartment from the ventilation box , said exchange and transition compartments being arranged inside the outer casing ; - external openings , carried by the external casing , each external opening being capable of alternately receiving an air spigot , to fluidly connect the transition compartment and an exterior of the ventilation box , and a blocking member , to close off the external opening ; - a main internal opening , carried by the main partition for fluidly connecting the exchange compartment and the transition compartment ; and - an exchange opening , carried by the outer casing , configured to fluidly connect the exchange compartment and the interior of the room ; characterised in that the ventilation box further comprises a blocking system , which changes between: - a passing configuration, wherein the blocking system allows a fluid exchange between each external opening not shut off by a blocking member and the exchange compartment , via the main internal opening ; and - a blocking configuration, wherein the blocking system prevents a fluid exchange between each external opening not shut off by a blocking member and the exchange compartment , via the main internal opening . - a passing configuration, wherein the blocking system allows a fluid exchange between each external opening not shut off by a blocking member and the exchange compartment , via the main internal opening ; and - a blocking configuration, wherein the blocking system prevents a fluid exchange between each external opening not shut off by a blocking member and the exchange compartment , via the main internal opening . <EOS>