I am getting a Quadrafire7100 and it will be a DIY install. One vendor who is not local said that if the temps here get below 32°, I need a Duravent Chimney system. The local vendor says that the Duravent is more for folks who live in REALLY cold areas and that in South Carolina the SL300 chimney system is fine. Quadrafire approves of either one and does not really say which is appropriate for me. Our typical night time temps are in the mid 20s to mid 30s, with an occasional dip into the low to mid teens. I will be burning mostly hardwood, but will also burn some pine. The Duravent is very, very expensive. If it's necessary, of course I won't hesitate to get it. But do I need it? Thanks!