Positive pressure means there is more intake airflow than exhaust. This causes excess air to be pushed out through the gaps ...

Blades: Static pressure and air flow, for example, require different blade designs to do their jobs. A static pressure fan has wider, thicker, flatter blades and is better at overcoming anything ...

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.