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Unread 04-27-07, 12:10 PM
Paul Sharp Paul Sharp is offline
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Join Date: Apr 2002
Location: Salt Lake City
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Paul Sharp is an unknown quantity at this point
You didn't say whether this was in warm weather or not, or up high where warm air shouldn't be coming in anywhere, but could there be a problem with the vent closing properly?

Make sure it isn't exhaust air coming in from an exhaust leak.
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