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Posted by HeyBub on January 2, 2007, 8:23 pm
CWLee wrote:
> After a very windy day I found a shiny item in my yard which
> I'm calling a "roof vent cap". I had a new roof installed
> about 15 months ago, and I assume this was one I had seen
> when I was watching the workmen.
>
> I painted it, and with a few tools got on the roof to see
> where it went. There are 7 or 8 roof vents having interior
> diameters of about 2". There are 2 roof vents having
> interior diameters of about 4". Both of these larger vents
> are within 3 feet of each other. I mounted the just-painted
> roof vent cap on one of the vents. I'm wondering if both of
> these larger vents should have such a cap. If not, I'm
> wondering if I selected the proper vent for my installation.
>
> As near as I can tell, the purpose of the vent cap is to
> keep rain and perhaps small leaves from going directly into
> the vent, so I think both vents need a cap. But looking at
> other houses in the neighborhood, I don't see vent caps on
> the smaller size vents, and on only some of the larger size
> vents.
>
> (From where these are located, I believe they vent the water
> heater, and the furnace - both natural gas burners.)
>
> Enlightenment appreciated on vent usage and recommendations.
The larger pipes exiting through the roof could be either combustion exhaust
for a gas water heater or for the dryer.
Can you get into the attic to see where these originate?
I don't think you would want rain coming down to the water heater flames or,
likewise, into the dryer vent. If rain gets into the sewer pipe, who cares?
As for cap absenxe on the smaller pipes, there's not much than can get down
a 2" pipe (or would want to do so).
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