I am in the process of installing a Jotul 500 Oslo. I was wondering how many people use outside air to aid in combustion? My house was built in 2000 so it's insulated pretty good. I was thinking instead of cutting some type of vent from the exterior of the home maybe cut a vent though the floor to a crawl space below the stove. The crawl space is well vented. What have others done? Air source or not?