Hi I have a Osburn 45-mf pellet stove .I am hoping the picture that I am sending doesn't come out to big . This is what my window on the stove just after just one evening of burning. I thought that I wouldn't have to wash the window more than once a week.I am washing this everyday any ideas on why this is happening?The guy we bought the stove from says it has to do with the air supply .I have tried many different things like turning down the rate feed to 2 and when I do that its a black soot that appears. So I am running it at the rate of 3 ,and I am keeping the air supply at about a quarter from the minimum setting. Would like to hear any opinion's from someone who owns a Osburn stoveThanks Peggy