My fans are in the eaves, so are about 71/2-8 feet from the floor, and aimed to blow over the roosts, not at the floor. I keep my coop fairly clean so dust has not been a problem. I'm not saying there is NO dust, that's impossible, but I clean the fans as needed, and wipe the inside coop down regularly, as needed, to keep dust minimized. I also have a droppings board, and that is scraped daily, and I spray that and roosts with white vinegar and wipe with a rag. Takes minutes, helps keep dust down. Having lots of ventilation also helps. What will work for you will ultimately depend on your set up.yes our climates are very similar... Was thinking of fans too actually but I saw some warning about fan and chicken dust