The first transition from the tail to 20 degrees is governed by DIN 22101 transition design formulas. The second transition starts at a 20-degree wing angle and the wing angle incrementally increases to the exit of the load zone at the final design trough angle (i.e. The first transition to 20 degrees is determined by the DIN 22101 formulas and generally requires only one specially-designed 20-degree transition idler. Generally, the need for dust control will govern the length of the second transition, therefore the second transition length equals tailbox + loading section + skirtboard extension (two seconds of belt travel times the belt speed for dust control is recommended for the extension). The offset picking idler design reduces idler junction failure.