I am replacing an old wood burning stove with a pellet stove. I would like to keep it in the same location in my single level house. Unfortunately, it is not near an exterior wall. Is it safe to route the outside air pipe to my attic as long as its well above the insulation and has proper mesh to prevent infiltration by critters? The attic is very airy. I'm located at 7000ft elevation if that makes a difference. Thanks for any responses!