Case and cooler fans come in two broad designs — "airflow" optimised and "static pressure" optimised — and using the wrong type in the wrong place quietly hurts your cooling. It's one of those details that doesn't show up until temperatures are higher than they should be. The difference comes down to fan blade geometry and what the fan is fighting against. Once you understand it, you'll place fans correctly and get the most from your cooling. This short guide explains it simply.
It complements choosing a case for airflow.
The Two Fan Types
- Airflow fans: designed to move a large volume of air with little resistance in front of them — widely spaced blades, optimised for open space. Best where air moves freely.
- Static pressure fans: designed to push air through resistance — denser, differently shaped blades that maintain force against an obstruction. Best where the air has to fight through something.
Many modern fans are "balanced," doing both reasonably, but the distinction still matters for best results.
Where to Use Each
- Static pressure fans on radiators (AIO/custom loop): a radiator is a dense obstruction; you need pressure to push air through the fins. An airflow fan here moves little air through the radiator and cools poorly.
- Static pressure fans on dense dust filters or restrictive front panels: same principle — they push air through the restriction.
- Airflow fans for open case intake/exhaust: where air moves freely (an open mesh panel, exhaust), airflow fans move the most air.
- The rule: obstruction in front of the fan → static pressure; open space → airflow.
Why It Matters for Your Temps
Put an airflow fan on a radiator and the radiator can't dissipate heat well, so your CPU runs hotter despite a capable cooler — a baffling result traced to the wrong fan. Conversely, static pressure fans in open exhaust positions are fine but not optimal. Matching fan type to position is free performance: it costs nothing once you know, and it's a common reason a build runs warmer than expected. In Nigeria's heat, getting it right preserves precious thermal headroom.
The Nigeria Tax
With less thermal headroom in warm rooms, correct fan placement matters more here — don't waste cooling by mismatching fans. Use static-pressure fans on radiators and restrictive front panels (common with dense dust filters, which you want in dusty Nigerian environments), and airflow fans for open positions. A balanced fan is a safe default if unsure. Pair correct fans with a good airflow case for the best results.
Frequently Asked Questions
What's the difference between static pressure and airflow fans? Airflow fans move lots of air in open space; static pressure fans push air through resistance like radiators and dense filters. The difference is blade geometry — using the wrong type in the wrong place hurts cooling.
Which fans go on a radiator? Static pressure fans — a radiator is a dense obstruction, and you need pressure to push air through its fins. An airflow fan on a radiator cools poorly despite a capable cooler.
Does fan type really affect temperatures? Yes — the wrong fan on a radiator or restrictive panel makes your CPU run hotter for no obvious reason. Matching fan type to position is free performance, and it matters more in Nigeria's heat where headroom is tight.
The One Thing to Remember
Match fan type to position: static pressure fans where air must push through resistance (radiators, dense filters, restrictive panels), airflow fans for open intake and exhaust. Get it wrong and your CPU runs hotter despite a capable cooler — get it right and it's free performance, which matters all the more in Nigeria's heat where every degree of headroom counts. A balanced fan is a safe default if unsure.
Building for the best thermals? Configure a build online → or talk to our team → and we'll set up the right fans in the right places for your cooling.