I'm in the process of getting a new roof and the first roofer wants to
install ridge vents, which I wasn't familiar with. I've done some
research and ridge vents seem to be a good idea? I have some questions:

I have a hip roof so do the ridge vents go on every ridge or just the
top or highest ridge?

I found a web page that talks about the relationship between the amount
of ridge vent and number of soffit vents.

http://www.rd.com/familyhandyman/content/18231/0

If you scroll about half way down the page they talk about Minimum
Venting Requirements. Is the information they provide correct? It says a
1,500 sq ft attic will need 10 sq ft of venting, half on the roof and
half on the soffits. They say the factor is 1 sq ft of venting for each
150 sq ft of attic. Is that correct?

--
JD..