PC Airflow Simulator
PC Airflow Simulator lets you set up the fans in a 3D computer case, then watch how air moves past your graphics card and CPU cooler before you move any hardware.
Interactive airflow model
Load the model when you are ready to build a case layout.
Build and Test Your Own Layout
The free preview plays recorded runs of four fan layouts in three case styles, including a build with an AIO liquid cooler. Computer Info Bits Pro unlocks the full simulator, with 26 ready-made fan layouts in five case styles, from a small Mini-ITX case to a full tower with 140 mm fans. Start from one or build your own: move and add fans, change their speed, direction, and model, add an AIO radiator, adjust parts, run your own airflow tests, and compare layouts. Each run shows your case pressure and how much air reaches your graphics card and CPU cooler. One subscription also covers the other premium tools as we add them.
Computer Info Bits Pro Annual
$35 per year
Billed once a year. Saves about 42% over monthly.
Subscribe annualPrices are in US dollars, plus sales tax where it applies. Cancel anytime. You keep access until the end of the period you've paid for. Payments are not refunded for unused time. Checkout, receipts, and your license key are handled by Gumroad.
You're signed in to Computer Info Bits Pro on this browser, so the full simulator is loaded above.
Open your Pro dashboardWhat you can learn before moving a fan
See the path: Watch air leave each fan with a swirl, flow around the parts inside, and exit the case.
Compare layouts: Save a build, change a fan, then run both layouts with the same settings.
Use the right level: Treat the result as a simulated estimate of air movement. It does not predict component temperatures.
Only need to compare intake and exhaust totals? Use the fan airflow calculator instead.
Build a Layout and Render the Airflow
Building your own layout needs a subscription. The free preview lets you open each recorded layout and explore its airflow in 3D.
- Pick a case type and a fan layout, or keep the default case.
- Select a fan to change its position, direction, model, and speed.
- Select Run airflow and wait for the result.
- Save the build before you change a fan when you want to compare two layouts.
Each fan is simulated as spinning blades that push and swirl the air. The blades are tuned so a fan on its own matches its maker's airflow and pressure data, such as ARCTIC's P12 fan curve. The simulation runs on your computer. Browsers that support WebGPU use the graphics card and finish much faster.
Filters, grilles, and heatsinks resist airflow, so the number printed on a fan box is not the flow it will always deliver inside a case. The Noctua airflow fundamentals guide explains how pressure and resistance change a fan's operating point.
Read the Airflow View
- Moving streaks
- Each streak points the way the air moves. Deep blue is slow air and pale cyan is fast air, not colder air.
- Fan rings and arrows
- Blue marks an intake fan and orange marks an exhaust fan.
- Air-speed slice
- Turn on the slice to see air speed across one flat cut through the case. Move it to check any depth.
- Fan results
- Each fan shows its airflow in CFM and the pressure its blades create. Compare these numbers between layouts.
- Case pressure
- Shows if your case runs positive or negative. Positive means more air comes in than goes out, so the extra leaves through gaps and helps keep dust out.
- Graphics card and cooler air
- Shows how much air the graphics card fans and CPU cooler fan pull in with your layout. An AIO radiator shows how it changes the airflow through your case.
Use the Result as a Comparison
A real case has cables, small gaps, and grilles that the model simplifies. The graphics card and CPU cooler are simple shapes whose fans run at typical speeds you cannot change yet. Numbers can also shift a little between the calculation detail settings, so compare layouts at the same setting.
Make one change at a time, then test the real computer under the same load and room conditions. The PC airflow optimization guide explains fan direction, common layouts, and repeatable testing.