From my experience, and there both people with different and similar experiences, so it's even possible that not all devices perform the same, here's other things I gathered:
If you screw the puromizer until it is finger tight (don't force it), and then unscrew the airflow ring until it is flush against the puromizer, the only airways into the puromizer will be the 2 small side slots in the puromizer right next to the airflow ring (plus the tight battery airflow - at least on my battery it's very tight).
You can check this by vaping normally, and then covering one and then 2 of the slots with your finger.
If you screw the airflow ring away from the puromizer and into the battery, the all-around gap between the airflow ring and the puromizer will work as an airflow source into the puromizer, so there should definitely be more airflow.
In normal usage, I do find the difference to be very slight (some don't notice it at all).
If there was only one of those slots instead of two, the effect of the airflow ring would be improved.
Just my 2c.
If you screw the puromizer until it is finger tight (don't force it), and then unscrew the airflow ring until it is flush against the puromizer, the only airways into the puromizer will be the 2 small side slots in the puromizer right next to the airflow ring (plus the tight battery airflow - at least on my battery it's very tight).
You can check this by vaping normally, and then covering one and then 2 of the slots with your finger.
If you screw the airflow ring away from the puromizer and into the battery, the all-around gap between the airflow ring and the puromizer will work as an airflow source into the puromizer, so there should definitely be more airflow.
In normal usage, I do find the difference to be very slight (some don't notice it at all).
If there was only one of those slots instead of two, the effect of the airflow ring would be improved.
Just my 2c.