WATER HEATER AND BOILER VENT PIPES

[CHARLIE VAN FLEET]

HEY ALL

found this in crawl space today. two water heaters vented together but this opening in vent stack. same thing for boiler. am i right that this is spewing co into crawl. my co detector did read low levels when water heater fired. or is this a right config???

cvf

[Bob Harper]

unlisted horizontal draft hood. That and the single walled connector should not be there.

Listed and approved draft hoods only and B-vent only in crawl space.

Condition of chimney?
clean out?
Liner?
Clearances to combustibles off that single walled pipe?
Support?
Screws?

[Dariusz Rudnicki]

If this is on the water vent pipe, it will act as a second draft hood, and double draft hoods are not permitted. It dilutes exhaust gases and might cause spillage into the crawlspace.

[DavidR]

unlisted horizontal draft hood.

That's all it's gonna take for me to give it the red tag. :)

Nice even rusting too.