As an example of Bernoulli’s Principle, the Ventui effect is that a current of air speeds up as it passes through a constriction. This is due to the rise in pressure on the upwind side of the constriction and the pressure drop on the downwind side, as air leaves the constriction. In keeping with this basic physics principle, to slow airflow through a transfer point, the enclosed area should be made larger.
On conveyor transfer points, this enclosed area is called a settling zone. A settling zone is the area past the loading zone’s impact area. The length of the settling zone is designed to slow the airflow and allow airborne dust to return to the main material cargo. The height of the settling zone should be such that the calculated airflow through the transfer shall be slowed less than 1.0 meters per second (200 ft/min).