Has anyone ever used a Tee in an horizontal run. my pipe leaves the stove runs 2 feet threw the wall and than is 18" from the outside wall. My local stove guy says that code here is 18". I found a tee at a local tractor supply for 5 bucks and bought it just cause I thought it was a good deal didn't really need it but,Anyway I thught about using it in the run outside to get me further away from the combustible wall. If I take out the clean-out and put it in the side it makes me a horizontial run about 10" with a bottom or top cleanout. my question is will this work or just make a lot of ash and cleanup for me?