Free Engineering Tools
Fan Selection Tools & Calculators
Fifteen browser tools for the questions that come before a fan order: which model is close to your duty point, how much air a cabinet needs, what a speed change does to pressure and power, and whether an EC retrofit pays back.
Each one runs on the page. No sign-up.
Which Tool Do I Need?
Start from what you already know. Most projects use two tools in a row, for example an airflow calculator and then a selector.
| You have | You want to know | Start with |
|---|---|---|
| A required airflow and static pressure | Which catalog fan comes close | The selector for your fan type, in section 03 |
| A model number or an old fan to replace | A matching model, or an EC alternative | Model lookup in the DC brushless, DC centrifugal or EC centrifugal selector; for AC to EC, the EC Fan Replacement Selector |
| The heat load inside a control cabinet | How much airflow to move, then which filter fan | Enclosure Cooling Airflow Calculator, then the Enclosure Filter Fan Selector |
| A figure in CFM and a datasheet in m³/h, or the reverse | The same airflow in the other unit | m³/h to CFM Calculator |
| A fan running at one speed or impeller size | Airflow, pressure and power at another | Fan Laws Calculator |
| AC fan power, running hours and an electricity price | Whether switching to EC pays back | EC Fan Energy Savings Calculator; for an AHU project, the retrofit ROI or TCO calculator |
| A BMS, PLC or relay output | Whether it can drive an EC fan | EC Fan Control Signal Checker |
Find a Fan Model
Enter a duty point, frame size or voltage and get catalog candidates. Results flag the ones that still need an engineering check.
DC Axial Fan Selector
Match DC axial fans across 14 catalog models, 225mm to 450mm, by frame size, voltage, airflow, static pressure and control interface.
Open toolDC Brushless Fan Selector
Filter DC brushless fans from 20mm to 200mm by frame size, voltage, bearing, airflow and static pressure, or look up a model number you already have.
Open toolDC Centrifugal Fan Selector
Match DC centrifugal fans across 48 catalog variants, 133mm to 450mm, by airflow, static pressure, voltage and control interface. Existing model numbers work too.
Open toolEC Axial Fan Selector
Match EC axial fans across 8 frame sizes and 11 performance variants, 200mm to 630mm, by voltage, airflow, static pressure and control interface.
Open toolEC Centrifugal Fan Selector
Match EC centrifugal fans from 133mm to 560mm by airflow, static pressure, voltage and Modbus, or look up a model number.
Open toolEnclosure Filter Fan Selector
Find FK33 and FK88 filter fan candidates by airflow, voltage, panel space, cutout size or the model you have now.
Open toolEC Fan Replacement Selector
Check whether an AC fan you already use can be replaced with an EC fan. Enter fan type, frame size, voltage, control signal and mounting.
Open toolEC Fan Size Selector
Pick a preliminary EC fan type and frame size from your application, airflow and static pressure.
Open toolAirflow and Performance
Unit conversion, fan laws and cabinet airflow. Use these before a selector when you don't have the airflow figure yet.
Fan Laws Calculator
See how a change in speed or impeller diameter moves airflow, static pressure and power. A reverse mode finds the RPM for a target airflow.
Open toolm³/h to CFM Calculator
Convert airflow between m³/h and CFM, then compare the result with published free-air ratings across Proventofan fan ranges.
Open toolEnclosure Cooling Airflow Calculator
Work out the airflow an electrical enclosure needs from its heat load and allowed temperature rise. Results in m³/h and CFM.
Open toolEC Retrofit, Cost and Control
For replacing AC fans with EC: energy saving, payback, total cost over several years, and whether your controller can drive the new fan.
EC Fan Energy Savings Calculator
Estimate the yearly electricity saving from switching AC fans to EC. Enter fan power, quantity and running hours.
Open toolAHU EC Fan Retrofit ROI Calculator
Estimate payback and 3- and 5-year net savings for an AHU fan retrofit from fan power, operating hours, electricity price and retrofit cost.
Open toolEC vs AC Fan TCO Calculator
Compare what AC and EC fans cost over 3, 5 or 10 years, counting purchase, energy and maintenance, and see where they break even.
Open toolEC Fan Control Signal Checker
Check whether your BMS, PLC or relay output can drive an EC fan over 0–10V, 2–10V, PWM or Modbus RS485, with wiring, feedback and alarm notes.
Open toolHow to Use a Tool Result
Treat every result here as a first pass. The selectors compare your input with published maximum airflow and maximum static pressure. A fan does not reach both at the same time; the real operating point sits on its performance curve.
The cost tools work from the figures you type in, so the answer is only as close as those inputs.
Before ordering, check the characteristic curve and the dimensional drawing, or send us the numbers and we will do it.
Send Us the Numbers From a Tool
Paste the inputs and result from any tool, or just your duty point, and our engineering team will check them against the fan curve. We respond within 1 business day.
