Hi guys, I just picked up an older box style woodstove with 4" opening in the top for $45. I was hoping to put it in my garage which is an uninsulated structure to provide a little heat while doing work out there this winter. I was suprised to find out that a class A chimney kit is $500+. I want to know what the cheapest way to install this is noting that it will not be used for extended periods or unattended. Thanks in advance.