Abstract: A method of fabricating panels includes providing an insert having an interior portion with a top portion and a positioning stop opposite the top portion, and an exterior portion including a fastener hem. Further, the method includes placing the insert in a mold such that only the fastener hem and the positioning stop contact the mold and centering the insert in the mold with the top portion and the positioning stop. The method also includes filling the mold with a casting material such that the interior portion is submerged in the casting material including the top portion, but some of the positioning stop is not submerged in the casting material, curing the casting material to form a panel on the insert, and removing the panel form the mold.

Abstract: A mill assembly for processing product comprises a mill housing assembly, at least first and second port assemblies defining an exterior inlet opening and an exterior outlet opening, at least one collection assembly, an air guide assembly, and a grinding assembly. In one form, a feed/collection ratio of the exterior inlet opening to the exterior outlet opening is at least approximately 1.5:1. In another form, seals are formed between the port assemblies and the mill housing assembly. In another form, the mill assembly operates in a first mode and a second mode. In the first mode, a ring plug plate and a wall plug plate are detached from the mill housing. In the second mode, the ring plug plate and the wall plug plate are attached to the mill housing to prevent air from flowing out of the third housing port.