Hello, I was looking at the pleasant hearth 1800 sq. stove at lowes. I live in a mobile home and need out side air for the stove. As far as I can tell the air comes in through the top above the door. Is there anyway I can make a metal box to fit over the opening and pipe it outside for fresh air, or does the main air flow come in somewhere else, I can't find a diagram for those stoves anywhere. Thanks for any help.