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This video demonstrates the difference in cabin vent position and the amount of potential carbon monoxide that can be pulled from the aft fuselage of an aircraft in flight. I have been able to demonstrate this effect in other aircraft as well as certainly NOT specific to a Zenith or the ULPower UL350iS engine that is installed. I believe it is very important to have a sensitive and accurate CO detector. Many if not most general aviation aircraft provide heat to the cabin by means of a heat shroud on top of the muffler which is then vented to the cabin. This video hopefully demonstrates other potential sources of CO poisoning.