Re: Vortex bowl?
I would be concerned that the holes would eventually become clogged with burnt juice and could pose a problem to clean considering their angle and placement.
Are the holes designed to reside under the shisha? If so I can see the logic but that supports my concern. If they are above the shisha line then my point is pointless. In this case this would be a simple change to the funnel that would eliminate the occasional problem with foil sucking into the hole (happens to me sometimes when the foil gets loose). I can't really say that it would change airflow much without testing it out.