Although I had heard about the frost fans numerous times before, I had never seen them up close until going with Ken to the Vienna orchards for a day. Of course the fans weren't in operation that day, but I could see that they had faithfully done their job back in the Spring, during frost-possible nights when the life of the fragile apple blossoms was in jeopardy. The fans work on the principles that frost won't occur as quickly with air in motion and that warm air rises/cooler air sinks. When the fans are operating, the blades "stir" the air and push the warm air lower to help keep the temperature around the trees above freezing.
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