Can I run a 2 inch oak up into the attic? I have a bossca spirit 500 that I will be putting in a corner of a interior wall. It used to be a corner wood burning fireplace built into the house.The house is on cement slab so no crawlspace. Can I run a 2 inch flex In the wall up to the attic and put a rodent cover on and call it good. The house is vented with about 20 soffet vents around the eve of the house. Is this a good option?