What are backflow cones and how do they work? "Backflow" cones are also called flow cones. Basically, they do not differ from ordinary aromatic cones, except for their special structure.In fact, the "backflow" cone inside has a small hole (tunnel). Inside this hole the air remains fresher.After lighting the cone, the fresh air will tend to descend downward causing the smoke flow of the cone instead of normally heading upward will tend to go in the opposite direction, that is, downward.Used with suitable burners such as our ceramic fountains in addition to scenting the environment will be able to achieve a splendid effect of sure impact and at the same time relaxing.