There is no definitive answer to this question since the appropriate height for a hot tent chimney depends on a number of factors. This is due to the size and shape of the hot tent, the type of fuel, the weather conditions, and the preferences of the people using the hot tent. In general, however, most experts agree that a hot tent chimney should be at least two to three feet taller than the tallest point in the tent, to ensure adequate ventilation and prevent the build-up of dangerous levels of carbon monoxide. Also, there is less risk of the sparks getting to the canvas and improving the draw.