Abstract: A door assembly for providing access to a chamber for processing food products includes a door supported at its midpoint and pivoted about a first axis. A pair of crank arms receive and support the door on the axis and are pivotally secured to the sidewalls of the chamber along a second axis parallel to the first axis. The opposite ends of the crank arms are secured together by a bar or beam preferably disposed along a third axis parallel to the first axis of pivot. A hydraulic cylinder extends between the beam and a pivoted support disposed on the top portion of the chamber. A pair of strut assemblies are pivotally secured to the door generally above the first axis and extend generally toward the second axis where they are likewise pivotally secured. Pivotal disposition of the door at four points on a pair of parallel axes ensures that all door motion is controlled and further provides a compact opening arc which permits placement of the chamber and door proximate loading docks and similar structures.