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We asked "the dust question" when Robyn and I were treated to a manager's tour of the Greeley display layout. I think Robyn put it, "How do you dust the scenery?" The answer was "We don't!"Take aways: 1) they did not cover the layout, which would be completely impractical, and 2) they did not dust anything other than rolling stock. Their facility was a new, clean building. After five years of operation I didn't really notice anything telling that there was a dust issue, although I would expect it may be an issue another five years from now.The bottom line is dust control in the first place. With the building pretty close to sealed-up, I have been testing a positive-pressure solution. At the moment the testing is with fans, but I'm looking at the possibility of setting up the HVAC in our layout building for positive pressure. This could be as simple as drawing intake air from exterior sources with the existing air handler and filter setup, then configuring the blower for higher default speeds.