I have a situation which is sometimes available in old houses. I Have an old currently unused chimney with 2 flues. One was originally for the kitchen stove the other for the furnace. I no longer have a wood fired kitchen stove or a furnace. In the old furnace room I would like to set up a drying chamber for sausage. Does anyone know of a mod. I can use to set up a recirculating air flow useing the chimney effect. how much elevation differential from flue #1 to flue #2. My current temp in the room is 64*F. I would ideally like to see 54*F. Come winter I expect it will be ball park. but I am aware that the air temps 30 or 40 ft from ground level are a lot lower than ground level. { used to climb telephone poles for a job} does anyone have any ideas or information.