So I bought a pellet stove and I want to install it in my split level home. I want to put it in the lower level but the first 39” of wall is solid concrete. That being said I want to install it with the pipe at the lowest possible level exiting so there isn’t a ton of pipe running up the wall inside then exiting to the outside. It’s in a corner and I wanted to know if it was okay to have the inner portion of the thimble contacting a stud. The marks to the left of the pipe are a stud or if that’s a fire hazard and it needs to be centered between the two studs somehow. Also how much pipe should I run vertically outside?