Hi All, I am new to this forum and to pellet stoves and I need some advice. I purchased a new Enviro mini A and need to install it on an inside wall. Once I go through the inside wall the vent will pass under a stairwell which will be a 4 foot run not including passing through the outside wall. So I should have about a 5 ft total horizontal run to a cleanout T (probably a double cleanout so I can clean that run easily). Then I will have a vertical rise outside the house as recommended. and finish it with a 90 and the termination cap. So my questions: -Should the vertical height be greater than my horizontal run? -If I assume a 5ft vertical my EVL would be 17.5 which looks like I would need to go 4" vent, correct? -What is the best place to switch from 3" to 4"? Should it be as clos to tthe stove as possible or would it be sufficient to use a 3" to 4" cleanout T outside? -I read that on a horizontal run you should have a 1/4" per foot rise in the pipe. How does that work? In my case would I just drill my outside hole 1" higher than my inside and lift the pipe to that hole? Any concerns with the fit though the thimble with the pipe at an angle? -Lastly the outside wall had a baseboard heat section that runs but since it is under the stairs does not do much. My pellet vent would come very close this this and the thimble would fit without cutting. Is it OK to cut the thimble to fit? Other options are to cut the baseboard cover but leave water pipe there (not terribly hard and cosmetics not a concern) or have a plumber remove the secion of baseboard (least favorable/costly). I thought about having an installer do the work but i am very handy and really enjoy doing these things in order to gain more knowledge about how things work. But I also understand the inherent risks of playing with fire and want to make sure everything is safe. No matter which way i go i will be pulling a permit and having the appropriate inspections. I appreciate any and all advice. Thanks!