Power vent water heater

[Chi Town Tommy]

I am looking to install a power vent water heater. I am fine with doing the gas and the copper, and PVC, but have not done any venting.

1. What are some of the codes related to doing a direct power vent water heater? I was told that there needs to be a vertical riser off the tank of at least 12", is this accurate?
2. Is there a max length of PVC venting? (Prob will not be an issue because I will just move unit over to an outside wall)
3. What distance from windows and or doors? Are the distances for vertical, horizontal, or both?

Thanks,

Tommy

[blackhat]

Most of that info is in the install manuals. Those are often available online as well. Pick one, check that manual and I can try and answer any more specific questions.