I have an enviro max pellet stove and I have 2 questions. The first is I am going to have a 5' veritcal rise with a 10' horizontal to the outside, is this length ok? The second is I am mixed up about sealing the pipe, one person I talked to says you need to silicone all joints in the inside the second person says you only need to seal only the first joint leaving the stove. He said this because if you need to take the pipe apart to clean it. Can someone help with my questions? Thanks