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Discussion Starter · #1 ·
I could not find this exact question answered elsewhere on the forum so hoping somebody can help me out.

We live in Seattle and recently had our oil furnace replaced with an electric heat pump system. The furnace was removed by the company installing the heat pump and oil tank was decommissioned by another shop. But we’re now staring at an open flue in our basement storage room and I’m trying to figure out the right way to “cap” it. Photo is attached.

Any help would be appreciated!
 

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So is the glue pipe routed through the house and out through the roof? If so, I would purchase the correct size plug or a cap that would seal the top.
Why, to keep birds, etc. from coming down into your basement, because when it is winter time, they will be wanting a warmer space.
By the same token, you can obtain a spring loaded decorative cap to cover the pipe in the basement, but I would stuff some rock wool insulation into the pipe before installing the decorative cover as to retain any heat or cooling if you are conditioning the basement airspace.
 

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Discussion Starter · #3 ·
Yes, the flue does route through the house and then out of our roof. That’s a great point that I’ll need to cap the roof end as well - hadn’t thought of that.

Do you have a link to one of these spring caps you referenced? I wasn’t having luck Googling for it. Also, are there any concerns about fumes or other pollutants coming back into the house if I don’t fill the hole with concrete or foam? I assume not given that it’s now just a dead pipe but I have small kids so always thinking about what I could be putting into the air.

Thanks for taking the time to respond. Super helpful.
 

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You actually don't need to cap the top, it should already be designed to stop rain, birds, debris, etc.

Just cap it in the basement.
Perhaps a metal cap with "furnace cement" will do. If it was a metal liner or b-vent, not a regular chimney screw and foil tape would do - the tape just to seal.
 
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