A continuous fire suppression system includes a fire suppressing vapor cooking medium circulating within a cooking chamber of a spiral oven; a temperature analyzer arranged to monitor a temperature of the fire suppressing vapor cooking medium; finned heating elements in communication with the temperature analyzer and arranged to heat the fire suppressing vapor cooking medium; a humidity analyzer arranged to monitor a relative humidity of the fire suppressing vapor cooking vapor medium; and a fire suppressing vapor cooking medium injector in communication with the humidity analyzers. the at least one fire suppressing vapor cooking medium injector arranged to inject the fire suppressing vapor cooking medium into the cooking chamber as needed to maintain a relative humidity equal to or greater than a relative humidity of no more than 10% vol. dry air with the remaining volume being the fire suppressing vapor cooking medium.