So I finally got my NC-30 hooked up and running last Thursday. First break in fire resulted in lots of smoke from the paint, but the draw was strong and I got no smoke spillage when reloading. I was out of town until Sunday night, so I didn't do any more burning until then. Sunday night's fire was a little slower starting than the first one, but still, good draw once established and little to no smoke spillage. Monday night I had a moderate amount of smoke spilling, but I could mitigate it by cracking the door for about 30 seconds before swinging it open. Last night, however, I was getting a serious volume of smoke pouring into my place on each reload, regardless of how slowly I opened the door. With the door closed, the fire seemed to be burning well, no backpuffing or visible smoke filling the firebox and some nice secondary action with the damper 1/2-2/3rd's closed. I should also add that I don't think my problem is temp related. It was around 41 degrees when I started the fire last night, and dropped down to about 25 by the time I went to bed. This morning I encountered the same problem at 20 degrees outside temp. I am in a rental property, so my options for major alterations are basically nill. However, I can think of a few steps that will improve my draft given my less than ideal situation. I have 42 inches of vertical [single wall] stovepipe into a 90*, then a 20 inch horizontal run through a thimble, into the "T." From the "T" to the top of the stack is only around 12 feet, but it is an insulated 5.5" Flex King liner. I know this is far less than chimney than ideal, but I can't go adding enough height that I will need to brace it, as my lease prohibits that sort of modification. It looks like I could go with a 2 foot extension on the chimney without needing additional bracing affixed to the roof. I am also planning to replace the 90* with two 45*'s in an attempt to keep flue gas speeds up from the stove to the chimney. So, will going from a 90* to two 45*'s and adding 2 feet to my chimney enhance the draft? My location is reasonably sheltered from the wind, but it is in the bottom of a relatively deep, narrow canyon, so I can be fighting general downdrafts on a regular basis. I am really impressed with how the stove burns and heats so far, a vast improvement over the previous woodstove I was using, but I would really like to minimize smoke spillage. I stinks having to throw the windows and door open for 15 minutes after a reload to air the place out. Thanks for the advice.