TOPIC: Dryer Ventilation

If you have a dryer vented to the outside on the roof close to a open vent. What could happen?

Do you have a picture? How Close? How tall is the open vent? Is it a plumbing vent?

Do you have a picture? How Close? How tall is the open vent? Is it a plumbing vent?

No Mike I don't. I just took the NHIE exam yesterday. It showed a picture of a dryer vent very close to an open vent on a roof. I just wanted to know if there could be a problem of exhause fumes going down the open vent causing monoxide poisoning

That could happen, but if it is a plumbing vent, probably not much CO would make it to the living areas. You would most likely get sewer gases coming in through the dryer vent.

I think it may happen if it is not a plumbing vent. Gases from plumbing vents generally do not reach the living areas in most cases.     

Harvey -

1.  Roof dryer vents are stupid anyway.  They are very hard to keep clean.  Out of sight, out of mind.  And difficult to get to.
2.  What kind of vent is the "open vent?"
3.  If it is a scoop vent, ridge vent or attic fan, the dryer vent is not adding much of anything, exhaust or humidity, into the house.  I am not sure of the point of the question. 
4.  If it is a plumbing vent it is no problem at all.
5.  There would only be CO if it is a gas dryer, and even if so it would be extremely little.  CO is almost the same density as air, so it would dissipate quickly.  Did they specify that it was a gas dryer?

Unless we could see the picture, it would be difficult to get to the point of the question.  Without that it is hard to answer.