looking to have a basement install of pellet stove. I’m a bit limited on where in walk out basement it can go as far as through the wall installation. I may not have the clearance for adding 7 foot of vent due to that running into a window. I have seen a number of manual say that this needed for draft in case power go out. Was wondering how needed this is and others out there have any experience with adding or not adding that 7 foot section.