I'm confused by your question. If you are asking what is involved in installing a pellet stove well it varies greatly from model to model. Generally speaking, most pellet stoves will horizontally terminate behind the stove itself as opposed to running thru the roof like a woodstove does. Pellet stoves require the use of electricity for numerous functions, one of which is power venting thru this rear terminated pipe. As far as clearances to combustables, you will find that pellet stoves are very forgiving in that department, with minimal clearances required. Once again all stoves are different and they all are rated indepentently so my best advice to you is find a quality pellet stove dealer and go in and see them. They will be more than happy to answer your questions. Avoid the big box stores as they have pellet stoves at a good price but offer NO service or installation and believe me, I am in the business, you will need professional service at some point during the life of your stove so don't save a couple bucks by going cheap. You will be happier for it down the road. Good luck.