If you are going to be building an outside chimney, like myself, I thought these PDF's I found on the net would be helpful.
http://gov.allconet.org/permits/Codes%20Graphics/ ... himney.pdf
http://gov.allconet.org/permits/04/DWG%2061%20-%2 ... ection.pdf
http://gov.allconet.org/permits/04/DWG%2062%20-%2 ... ion%20.pdf
I was going to add them to the Knowledgebase, but wasn't sure how to do it.