Was looking for something to move warm air horizontally from an unheated, south facing hot house into an adjacent living room. Fan works well but is too small and does not provide any blockage from cold air coming in at night or on cloudy days when the fan is off. I am trying to devise a light flap that would drop down and cover the end of the 4 inch aluminum duct I added to pull the warmer air into the center of the room, but nothing effective yet.

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