yeh I will remove the tape once chimney is finished. I stick it there to stop smoke whee when I tried the first fire with my shirt chimney. HahaRemove all the metal tape. The adhesive is not rated for flue temps. This is not like a pellet stove, it is not necessary. Once you have a proper chimney you will see a very big difference in stove performance.
15 ft outside sounds excessive for this stove. It has no secondary combustion channel to draw air through. I agree with bholler that 7' should be sufficient. Is 15' the minimum necessary to satisfy the 10-3-2 rule?