Quick question.. I have an older Hearthstone wood stove ... over the summer we had our house resided and I had the contractor put foam insulation and seal up the house really tight... my would stove doesn't have a fresh air intake out to the garage.. I have a 1 1/5" opening on the back of the stove just curious what kinda pipe I need to get some air to the stove with.. the stove gets pretty warm about 400-500 degrees on the top of the stove.. don't want the pipe going outside to start the wall on fire.. so just curious if I need outside air and if so what kinda pipe do I use .. thanks in advance...