Hello, I am looking to install a Harman P-61 Pellet stove in a corner of my Living room. I am also considering putting up Faux stone (GenStone or similar) on these 2 corner walls. I would like to run the exhaust/intake air pipe through the wall near the bottom, so a hole would need to be bored through the Faux stone, drywall, and the rest of the wall outside. Are there any issues with having the faux stone surrounding the exhaust pipe going through the wall, or clearances I should use to keep the stone material away so many inches from the exhaust pipe?