Hello all i have a little avalon insert in the basement of my trilevel house. The flue is around 24 feet long. I only burn on the weekends mostly good dry ash or soft maple. Every so often I have to use a hand held torch to help reverse the draft but this morning I tried and not matter what I tried I couldn't get it to pull a draft. I didn't lite the fire yet so I didn't smoke out the house. But what could the issue be. Thank you