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Old 02-25-2012, 11:38 AM  
larryslade
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Default Duct Rust

I have a cold air register for my oil furnace in the front hall. Living on the east coast and getting a lot of snow, a lot of water gets through the register from leaning wet shovels against the wall and walking on the register with snowy boots on. Recently I started hearing a banging noise down cellar. One suggestion on this forum was it was caused by the ducting cooling off when the furnace shut off. I just realized that the ducting leading down cellar from the front hall register, from years of moisture running down it, had rust on it and a small hole had developed. Anybody know a way to patch the hole and get rid of the rust? Thanks


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Old 02-25-2012, 03:04 PM  
nealtw
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If you have access from below your best bet would be just to repace it.
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Old 02-27-2012, 12:04 AM  
BridgeMan
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If the rust isn't too extensive, and the hole is just a small one, try the following: Wire-brush the surface rust off, then hit it with some zinc-rich spray paint. After the paint is dry, install a surface patch of galvanized sheet metal, using sheet metal screws and a sealant under the metal.
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