The hot aggregates leave the dryer drum in a chute and are picked up by buckets in the hot elevator
(Figure 16.5), which delivers it to the screen deck in the tower. The screen deck has a number
of vibrating screen decks, arranged in a way such that the screen with the largest opening is at the
top and the smallest opening is at the bottom. The screen sizes may range from 1½ to 5/32 in. The
screened aggregates land in hot bins, which are placed beneath the screens. The screens help in
separating the composite aggregate sample batch into different portions, depending on their size.