Correction - stove is a 25 PVC not PDF. Must have been thinking about work and electronic drawing formats. So our power went out around 12 midnight during the big storm a couple weeks ago. Soon after the smoke alarm went off. Came down stairs and the house was full of smoke. It was coming out from under the hopper lid. Had to open it to see why and of course got a big woof of smoke. what the heck is going on. Dug down in to see what was happening and I scooped out black (burnt) pellets. Dowsed it quickly or I was going to have these pellets igniting any second. After getting most of the smoke out of the house, we went back to bed. The next day I tried to figure what went wrong. This is the first time in three years the stove ever lost power. Even then the fire should have gone out. Then I realized that the hopper lid was not tight when latched and this of course created a route for the fresh air to escape, with it came the smoke. Stove has been all cleaned out. Hopper lid latches are tight now. Stove working great as always.