Neighbor has LP stove vented out to backyard patio. He's in process of covering the patio with a roof and will be over the vent. He will have partial wall and window enclosures to make it kinda like a room, but won't be like a normal room with walls and windows that are air tight and such, but it will still be like an "outdoor" room. But, the vent will now be in this "room". So, the big question, will this be a problem?