This was my first time doing a project like this. I had the stove running last night for a while and it seemed to be working great. It's a 45 off the back of the stove (Mt. Vernon), 2' through the wall thimble, 10' up from the cleanout T. There's about 4' above the roof and it extends higher than the peak. I'm hoping I installed it within code. I noticed sparks once every minute or so coming out of the cap but they never made it to the roof without fizzling out.