I'm getting irritated trying to find out the truth about chimney pipe. Stove shops want me to buy the brand Sellkirk pipe from them and it is pricey. They say the stuff at the box stores is junk (they are talking about Duraplus triple insulated pipe). One stove shop said they use special stuff that a DIY person can't purchase. Whats the deal guys?? I just want a safe metal chimney pipe up the side of my house. From Tee to cap will be 16 ft. I see Duraplus, Dura tech, Duratech canadian, and Sellkirk. But even Sellkirk looks like they possibly make more than one pipe for wood stove chimneys that go up the side if your house.