I am so glad I found this and will be even happier if you are able to answer my question. I bought a US Stove 5500M and had it installed like the instructions said, out the wall and less than 180 degrees worth of bends, its clean and running fine except the fire pot fills up with ash like a brick within the day, do I need to run an outside air source, I live in Eaton, Ohio if that helps. The flame looks okay but when it starts to get full it will have a haze right below the flame. The pellets should be fine they have been indoors in a warm house long before I even got the stove installed, thanks for any help