Positive pressure means there is more intake airflow than exhaust. This causes excess air to be pushed out through the gaps in the case, helping to keep dust from entering where it shouldn’t. It’s ...

If static pressure is a concern, if you can fit a 38mm thick fan those usually can flow more against a higher static pressure.

A family of application-specific dc fans—the VA series—delivers high airflow and extremely high static pressure in the most popular frame sizes.