Playing about with scrap heap materials to make a hot smoker. Plan is to put another bottle on top to hold the food and smoke, does anyone have an idea of where the chimney should then exit? Straight out of the top is easy and should give a good draw, but potentially heat and smoke could exit too quickly? Other option is out of the bottle sideways with a 90⁰ bend but how far up or down to get a good draw and smoke