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No, they don't hook to any thing at all, Just a straight shot to the outside of the house. The furnace is a foot and a half away. No caps no covers just a pair of tin tubes piping in cold (3 below 0 ) air. The house has A/C. I shoved a towel in them and the house is warming up. I think they are left over pipes from a old system? It was built in the 70s. The owner must have had a horrible heating bill. Thanks for the help. I'll keep a eye on things and give the owner a call.
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