When did they come out with B-Vent?

[rhornung]

Trying to determine if an installation is original or after the fact.

[Roy D. Cooke, Sr]

No idea this might give you some ideas ... Roy

http://inspectapedia.com/chimneys/B-Vent_Chimneys.htm

[rhornung]

They do a great job of defining what it is, but not when it was developed.

[Bob Elliott]

Try the Hart and Cooley site.
I have no time to search today but it may be there.

[Linas Dapkus]

I'd like to help you too but I'm eating a late lunch working on my report.

[rhornung]

Finished the report, and still haven't found it. Wrote two long ones this morning now I'm headed out to do a winterization. I ended up just reporting the clearance problems and didn't make any statement about whether or not it was an after the fact installation or not.

[Linas Dapkus]

Thanks for the update. How was lunch?

[Jeffrey R. Pope]

Originally Posted by rhornung

Trying to determine if an installation is original or after the fact.

Transite piping (asbestos-based cement piping) was a listed B-vent, and used through the late 70's. Modern B-vents are double-walled steel, and originated (I believe) in the early to mid 70's.

[Dan Bowers, CMI]

Ryan -

Who cares if it was done originally or not. If it has clearance problems its wrong.