Maybe I haven't explained how this is properly.
The house is double storey at the front. The heater is to go in the lower rumpus area in the lower part of the house. The flu will go up the wall maybe 6ft and then do a turn and go through the brick wall and outside then do another turn and go up the exterior wall and end above the roof line.
Heres the house. To the left of the pic is the room down the bottom where I want to put the heater.
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Heres the room. Its going against the far wall, just to the left of the grey couch. So the flu will go through this brick wall and go up the outside. If you get what I mean...
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So the only section of the flu that will be inside the house is the first part from the heater to the section where it goes out through the wall.