I have a pellet insert and I use the cleanout door opening , in the fireplace, for the fresh air intake. The cleanout goes to my basement and I leave the basement cleanout door off. I was thinking of getting a 25 foot 4" aluminum flex pipe from Home Depot and running it from one of my basement windows to the cleanout door in the basement. My question is: Will this work for an outside air kit and will I notice any difference in the way my stove runs? My stove seems to be running OK, but if it would run better with the flex for the outside air, it would seem to be a good $20 investment.