Im going to install a Hobbit stove. I would like to use their flue kit which is single skin to near roof, then double skin (https://salamanderstoves.com/wp-content/uploads/2014/06/canal-boat-flue-kit-.pdf), rather than say the morso double skin kit as this is 5" and I think looks to big for a tiny stove... I know the official line (http://www.soliftec.com/Boat%20Stoves%201-page.pdf) is that ss flue must be > x3 dia of flue from unshielded side-wall, which would be 12" in this case as the Hobbit uses a 4" flue, and thats what they as manufacturers say, cos theyve got to stick to the official line... But for space Ive got it looks like its going to be just over 8" to bulkhead which is 3x2" studded partition construction faced with fireboard + tile to 1m height, then, and its this bit that thats the area of concern, from thereon, 18mm oak floorboards to ceiling. So...the question is: Is 8" okay from a ss flue to 18mm oak floorboards or am I going to immediately die in an inferno and I need to get a double skin flue ?