Last year I installed the stove and kept the grates( bottom center of stove) closed all the time and didn't use the pan. I was talking to soneone about having trouble with my draft sometimes and he said running with those open would help with that . I am in a basement,I know that's not ideal, I have a 90 going out then a 90 up, again,not ideal and I have plenty of clearance and height on the chimney...I was getting light smioke rolling out when loading in the cold weather. Fall and early winter was fine. Thoughts on the grates please.Thanks!