The unitary metallic plate is formed into {TAIL ~ a panel}, channel walls, {HEAD ~ at least two feet}, and at least one external reversing bend 
The unitary metallic plate is formed into { TAIL ~ a panel } , channel walls , { HEAD ~ at least two feet } , and at least one external reversing bend
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH