Got up this morning to an 18 house. So, the wife asked me to start a fire. I happily obliged I got the wood stacked in the stove, put the lighter to it, and smoke started coming out the door. For a moment, I thought the bypass was closed, but, it was not. Then, smoke started coming out of the flu right at the 90 (2 - 45's) going out the wall to the Tee. I then thought that there may be an animal taking up residence in the chimney. So, I went to the Tee and looked up, nothing. All clean and clear. Back in the house, in the stove, the fire had gone out, so, I took a chance and started it again. All went well this time, smoke went where it was supposed to go, fire is burning hot and house is getting warm. Just another weird thing that happened to me this morning. Oh, and the smoke that came out, didn't rise to the ceiling. In fact, it all sank to the floor, and hovered down there. I had about a foot of smoke billowing on the floor. Looked kind of cool, in a scary sort of way.