Do It Yourself Section:
Your finished chimney needs to be 3 feet above the roof-line and 2 feet
above anything that is 10 feet away. We can not be sure of exactly how
much chimney pipe you need and the kit is only based on an average home
as explained above. You are totally responsible for the height of your
chimney,

DuraTech Install Instructions
http://www.duravent.com/docs/instruct/L150%20Dec05.pdf

