Patent ID: 8568077

Claim:
A dust control apparatus for use in an apparatus for rotary dumping of rail cars, comprising: a backside hood having a primary air intake for removing contaminated air from a pit, the backside hood being in fluid communication with exhaust fans; a diverter, overlying the backside hood, the diverter having a concave curved upper surface shaped to accommodate the passage of at least two baffles supported by a baffle support including a first baffle and a second baffle separated by an interbaffle space; and at least one secondary air intake positioned to pass through the upper surface of the diverter into the backside hood, the secondary air intake being located approximately where pressure in the backside hood remains neutral or negative relative to a pressure in the interbaffle space even when downwardly rushing material dumped from a railcar into the pit causes a transient increase in air pressure in a lower portion of the backside hood.