Car dumper dust control system

A method of making a dust isolating enclosure for use in an apparatus for rotary dumping of rail cars, comprising:

• suspending three flexible baffles from a rotary dumping structure, including a first flexible baffle, a second flexible baffle and a third flexible baffle such that each of the three flexible baffles extends downwardly under the influence of gravity from the rotary dumping structure;
• spacing the three flexible baffles evenly apart from one another by a separation distance;
• positioning a diverter having a concave curved upper surface beneath the rotary dumping structure with a concavity of the concave curved upper surface being positioned such that a lower edge of two of the three flexible baffles is in contact with the concave curved upper surface during a portion of rotary motion of the rotary dumping structure thereby at least partially enclosing a first volume between the first flexible baffle, the second flexible baffle, the concave upper surface and a first portion of the rotary dumping structure during a first portion of the rotary motion and thereby at least partially enclosing a second volume between the second flexible baffle, the third flexible baffle, the concave upper surface and a second portion of the rotary dumping structure during a second portion of the rotary motion;
• and
• creating an intake opening passing through the concave curved upper surface and positioning the intake opening such that operable fluid communication is established between the first volume and an exhaust fan during the first portion of the rotary motion and such that operable fluid communication is established between the second volume and the exhaust fan during the second portion of the rotary motion whereby dust laden air is withdrawn from the first volume and the second volume sequentially.