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I would use the old gas vent with the existing exhaust fans without concern. The only issue I could see if one fan was on pressurizing the duct the second one might have trouble opening its back draft damper because of the pressure (both fans should have back draft dampers). I would check to verify that both will open when the other is running. If anything I ...


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Two issues here... duct work for a range hood normally follows the same restrictions as a dryer. The air is expected to be hot, so you need a sealed metal tube for it to flow through. You can't use plastic or wood or any other combustible or meltable materials. In practice, the air probably isn't much hotter than the ambient temperature of the house, but ...


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Upshot - the floppy tube gets hot and starts deforming. Its obviously not capable of carrying warm air from a portable AC. My temperature sensor says ~40 degrees on the outside. The fixed tube doesn't seem to care - it is what came with the AC and copes with the heat fine. The aluminium tube copes with the heat too, but it leaks the heat back into the ...


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