Abstract: A chill cooler for meat packing plants having a revolving air interlock for separating the same from the kill floor. The air lock includes a vertically oriented cylindrical housing having a first entrance opening to the kill floor and a second exit opening to the cooler. A plurality of doors rotate about the axis of the cylindrical housing and their outer edges are in sealing wiping engagement with the internal housing surface to isolate the kill floor from the cooler as meat sections are conveyed through the air interlock. A conveyor passes through a compartment disposed above the doors for moving meat through the air lock.