Directional Airflow refers to the process of turning a carb cap on a dab rig during combustion. Caps designed for directional airflow have curved holes that go far into the rig for better convection. The airflow carb cap is a very important part of the dab rig and the better the design, the better the ability to direct the airflow into corners of the quarts banger that normally wouldn’t be reached. This allows you to spread the material more evenly across the heated surface. It basically makes sure that the concentrate is all being vaporized and there are no remains that are wasted afterwards.