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Message: <blockquote data-quote="faithlocket" data-source="post: 2492962" data-attributes="member: 853175">Do I have to send all that money in the form of heated air up the chimney? Why???I have a stove that burns natural gas and it vents into the room.I used to have a dryer vent with a "winter" and "summer" setting... basically the winter setting put the dryer hot air back in the house.They all run on natural gas, so why does the furnace need to be vented. I know it is supposed to but I don't understand why.I have a CO detector and it doesn't go off when I put it inside the exhaust from the furnace.</blockquote>