Patent ID: 8292566

Claim:
A method of improving dust control in a rotary rail car dumping facility, the method comprising: creating at least one secondary air intake positioned to pass through an upper surface of a backside diverter into a backside hood, the backside hood being located in a pit; locating the secondary air intake at a location at least an attenuating distance from a primary hood intake such that when the pit is subject to spike increases in pressure initiated by a load clearing a rail car and entering the pit, the spike increases in pressure travel into the backside hood the attenuating distance from a primary hood intake before being attenuated, the attenuating distance being that distance from the primary hood intake at which a pressure within the backside hood is less than or equal to a pressure in an interbaffle space that is located between two baffles that contact the upper surface during at least part of rotation of a rotational frame disposed at least partially in the pit.