What is this open-ended PVC pipe coming out of the furnace for?


Old 12-11-14, 09:53 PM
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What is this open-ended PVC pipe coming out of the furnace for?

Had someone replace our ac and furnace a month ago and just noticed this?

The Pipe goes straight down for about 2 1/2 ft. Then it bends 90 degrees into the wall. There is no U-Loop or whatever.

Should this be closed? It's not leaking out fumes or gas or anything right?

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Old 12-11-14, 11:22 PM
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Welcome to the forums.

That is a condensate line from the evaporator coil. I like to put a trap in the line but it's not always done. Nothing dangerous, no fumes will leak out.
Old 12-12-14, 03:39 AM
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There still should have been a trap and a cap on the pipe sticking straight up that's left unglued so it can be used as a clean out.
One reason is so insects or even a mouse can not make entry.
Old 12-12-14, 02:22 PM
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Being a positive pressure drain you do not need a trap. Capping the vent is fine.
Old 12-12-14, 07:38 PM
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The drain line will drain better with the vent uncapped.
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