I'm installing a Piazzetta Monia, direct vent, and am trying to decide how to run the exhaust vent. Is it better to go out the wall then rise 5 feet; or rise 5 feet inside the house then out? I've heard that if there's a power outage, a better draft is created if the vertical rise is inside the house. And I've also heard that it doesn't matter if the rise is inside or outside. What's the truth?