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Old 02-21-2011, 03:19 PM   #10
robmac
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I have seen alot of power vent tubes that have not been installed properly IE the outside pipe. I always make sure if it's a 90% furnace to have it above the intake by at least 12 inches and that I have a 45 fitting on the end with plumbers cloth stuffed in so no rodents or birds can clog it. Always make sure your outside exhaust is free and clear.
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