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I cut a 6" opening in an insulated door into the utility room then installed a 6" metal duct with a plastic exterior vent cover. I put 6" insulated flexible duct on the interior stub and let it hang to the floor where I put it into a 5 gallon bucket as suggested in an earlier post. PROBLEM: cold air is overflowing the bucket with out the negative pressure of the combustion prompting it. How to control so no cold air except when pulled by furnace burning?

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Can you link to the earlier post, please? It's difficult to tell what problem you're trying to solve here, so a bit more information might be useful. It sounds like you followed bad advice, and need help remedying the situation. But it's difficult to provide a good solution, without knowing exactly what you're trying to do. –  Tester101 Feb 10 '13 at 13:18
    
I believe klipper is referring to this answer which appears to have been bad advice. –  BMitch Feb 10 '13 at 14:11

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