Abstract: A shield assembly forms a loop for guiding heated gases from a heat source along a peripheral wall of the container and may include a plurality of guide panels collectively in an array of connected guide panels. The guide panels may be pivotally connected to adjacent guide panels to pivot with respect to each other to pivot with respect to each other. The guide panels may have a base plate with an inner surface for orienting toward the container, and may also have at least one vane extending inwardly from the base plate to a free end of the vane positionable adjacent to the peripheral wall of the container. The vane may be positioned at an oblique angle to the pivot axis. The shield assembly may also include a linking structure configured to link endmost guide panels of the array of connected guide panels.