New to this site and gas stoves. I just got a jotul 600 dv II. Will be installed soon. The question I have is. In the jotul book it says '' 87 % efficiency with maximum vent configuration ". What does max mean. My installer wants to go min with 2 ft up and out. If you go higher do you get more efficiency out of the stove. Is it the longer the pipe the cold air has time to warm coming in the house? Does the pipe give off that much heat in your house? I want to put a 5 or 6 ft pipe up than out. Will the efficiency be higher. Thank you very much. Todd cold in michigan..