Just began firing up my Jotul f100 and I'm getting a little bit of smoke coming out of the rear. Here's my chimney setup: Rear vent out of stove into a T Up 4 ' into a 90 degree elbow into 18" duravent into a duravent T and then up 20'. outdoor temps are in the 20s. It is only a little bit of smoke beginning when I start to close the air intake a little. The space it's heating is a new, well insulated 300 sq foot space. Starts easily, no smoke coming out the door when it is open. Given the way the space is set up it is almost necessary to vent out the rear to allow for clearances. The one part of the install I am questioning, especially given where the smoke is coming out, is the installation of the first T. I installed the T with the male (crimped) end facing down and a cap on the bottom. Is this correct, or should this end be facing back instead of down? Or is the male end supposed to be connected directly to the stove, which would also leave the capped end being at the rear of the stove? thanks folks.