Unfinished flue in the attic...

[Marc M]

This was a 2008 house, gas factory built fireplace. Didn't even penetrate the roof.

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[Gunnar Alquist]

This was a 2008 house, gas factory built fireplace. Didn't even penetrate the roof.

What? You want it to go outside? That's not the way we do things in CA.

[Marc M]

It's funny, this was a petty new house and everyone left, agents, clients etc. because the house was so new and nothing was coming up...right before I went into the attic.

[James Duffin]

They didn't by chance decide to install a vent-less fireplace did they?

[Eric Barker]

To be more technically correct, it's an improperly terminated vent.
The flue is the space inside the vent.