We're arranging an install for our new 10-CPM. The house is 6" construction (issue). The stove needs to be 6" from rear wall per manual. According to code, can't have a seam inside the wall. Planning on horizontal run out the house and a 5' vertical. I want to keep the outside verticle run at 3" from outer wall. Planning on ordering Duravent corn pipe as recommended by Englander. Any experienced pellet pros have any idea on what I should order?