This particular entry relates to using a movable DAMPER inside the duct system to keep warm (or hot) air from going backwards in any part of the duct system.
First, consider an X-Ray view of the main trunk line duct from a conventional warm air furnace. (See the drawing) We're looking through the side of the duct. The blue lines represent the top and bottom surfaces of the duct. The furnace is to the left, sending warm air (red arrow) through the duct to the house registers to the right.
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