A continuous fire suppression system includes a spiral oven including a cooking chamber and a spiral conveyor； a fat drippage in the cooking chamber which falls downwardly through the spiral conveyor； a fire suppressing vapor cooking medium circulating within the spiral cooking chamber which suppresses combustion of the fat drippage； an analyzer arranged to monitor a targeted condition in the cooking chamber wherein, in the targeted condition, the fire suppressing vapor cooking medium is present in the cooking chamber in an amount of at least 90% vol. and air is present in the cooking chamber in an amount of from 0% to 10% vol., the remainder volume being the fire suppressing vapor cooking medium.
