My recently installed jotul f100 (small) spills quite a bit of smoke when loading. The draft control also completely chokes the fire to death at anything below 1/3 open. The stove rear exits and runs 30" horizontal (1/4" rise /foot) with one 45 deg. before entering the metalbestos pipe that runs 21' vertical (4' above my peak). I've used airtights my whole life for primary heat so this is a real mystery. The Jotul dealer said I'm not burning the stove hot enough- that i have to get it to 650 degrees! I can only get it to 600 with the air all the way open, and besides, who ever heard of a stove that needed to burn at 650 so that it woudn't spill smoke when the door was opened? How do i heat the house when it's in the 30's or above outside without sweating everybody out?