Transition adapter for a material handling system

A material handling system comprising an input conduit section having an input cross-sectional shape, an output conduit section having an output cross-sectional shape that is different than the input cross-sectional shape, and a transition adaptor connecting the input conduit section and the output conduit section providing a transition between the input and output cross-sectional shapes, the transition adaptor comprising:

• a crown piece that has an inner end and an outer end having an elliptical sectional shape, wherein the inner end of the crown piece has four crest portions, each of the four crest portions separated from adjacent crest portions by a valley portion;
• a box piece that has an inner end and an outer end having a rectangular sectional shape, wherein the inner end of the crown piece mates with the inner end of the box piece, wherein the box piece is formed by a first box half and a second box half, wherein each box half is formed from a flat piece of metal and is formed by bending the box half about bend lines.