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Rain is entering the flu pipe

PostPosted: Tue Dec 13, 2011 2:30 pm
by Service
Any chimney top or flue vent should have a raised cap over it to prevent water from entering. There's usually about a 3 inch or more clearance between the top of the vent, and the pitched cap over it, with mesh around the opening to keep animals out.

Water entering a chimney is very bad - over time, either mortar will work it's way loose, or a metal chimney stack will corrode. In both cases, flue gases and carbon monoxide can enter your living space.

Water entering the flue stack for a gas furnace or water heater will corrode the unit itself, specifically the heat exchanger.

Better get it checked out.