I just purchased a used craft stove insert that i want to put in my shop. It vent out the top through a rectangular opening. It has two door with glass in them no model number that i can find. Also it does have a blower on it. Ive been looking at this forum some and realized how little i know. I have little experience with wood heat despite the fact that I am a plumbing HVAC guy for 20 yrs. Gas furnace, Oil burner, or heat pump I know Wood burners i do not. My plan is to put legs on it get it up off the floor. When it comes to venting it i had planned to build an adapter to convert it to a 6" round pipe go up a little then elbow out the wall and outside to a 8" steel chimney that would be approximately 20 ft tall. is this ok or should i go straight up off the heater through the ceiling then terminate the roof? i would prefer the first idea. After reading a little on here i see some things about cold chimney causing problems. So im here asking for help seems there are some good seasoned people on here. Thanks in advance.