I have a single floor home I am putting the stove half in an alcove( where a zero clearence fireplace used to be ) , the chimney will be center of a 6 foot alcove it will be at least 10 inches on all sides from a combustible as per manufacturer specs (is 2 inches), my stove pipe is going straight up through a flat ceiling support up the chase and out the chase cover. Someone told me (a chimney sweep guy) i need a fire stop ? if im not running my pipe through a second floor than why do i need a firestop ??? and where am i going to put it?? im thinking he is wrong ??? thanks