A web-based fan selection tool has been launched, letting engineers size fans by airflow, pressure, and temperature and receive an instant PDF of the chosen duty and curve. The tool aims to turn a slow back-and-forth into a self-service first pass at specification that still ends with a human check.
What a Good Selection Tool Does
A fan is selected where the system resistance curve meets the fan curve, at the point that gives the needed airflow at acceptable power and noise. Doing that by hand means reading catalogue curves and interpolating, which is slow and error-prone, and which is why many fans get specified at a safe overestimate that wastes energy for a decade. A selection tool takes the three inputs that define the duty and returns the model and speed that land on the efficient part of the curve.
Temperature matters more than people expect: as air heats it gets less dense, so a fan moving a given volume at 40°C needs a different setting than at 20°C. A tool that asks for temperature avoids the common mistake of sizing at standard conditions and then finding the unit short on a hot roof or in a process stream, where the air is nothing like the test lab.
The instant PDF closes the loop for the engineer, who can drop the duty, the curve, and the model code into a specification or a submittal without waiting on a quotation. It is a first pass, not a substitute for a final check, but it removes the blank-page problem at the start of a design, when the engineer is still shaping the ductwork.
The tool also disciplines the enquiry: by forcing airflow, pressure, and temperature to be stated, it stops the vague "I need a fan" request that wastes both sides' time, and it gives the supplier a real duty to respond to rather than a guess to correct.
Tool Inputs and Output
The table shows what the tool takes and returns, the small interface that hides a large catalogue behind it.
| Item | Detail | Note |
|---|---|---|
| Input | airflow | m3/h or CFM |
| Input | static pressure | Pa or in. wg |
| Input | air temperature | degrees C |
| Output | model and speed | efficient duty point |
| Output | PDF with curve | for submittal |
By returning the curve, the tool shows the engineer where the operating point sits, so an oversized or corner-of-the-curve choice is visible immediately rather than at commissioning, when changing the fan means ripping the duct.
The PDF also becomes the record of the selection, which matters when a dispute arises later about what was specified and why, because the duty and the curve are captured at the moment of choice rather than reconstructed from memory.
Checklist for Using the Tool
Engineers should treat the tool output with these checks before it goes into a spec, because a fast answer is still an answer that must be right.
- Use real numbers: enter the actual duty, not a rounded estimate from a similar job.
- Include temperature: always state the operating air temperature, hot or cold.
- Read the curve: confirm the point is on the efficient part, not the edge.
- Flag special duty: dusty, corrosive, or explosive atmospheres need a human review.
- Keep the PDF: store the output as the record of the selection made.
Why a Self-Service Tool Helps
Specification speed is often the difference between a fan being specified or left out of the early design. A tool that gives a defensible first pass lets engineers move quickly while keeping the final check with a person who knows the duty, which is the right split of machine speed and human judgement.
For the manufacturer, it also means enquiries arrive better defined, so the technical reply can focus on the hard parts rather than basic sizing, and the quotation reflects the real duty instead of a correction to a vague request.
The tool does not replace the engineer; it removes the friction that stops the engineer from starting, which is where most delayed specifications actually stall.
A practical caution is units: the tool should accept both metric and imperial, because a duct designed in pascals and a fan quoted in inches of water gauge will not match unless someone converts, and conversion errors are a quiet source of mis-sized fans. The engineer should enter the duty in one system and read the result in the same, confirming the equivalence rather than trusting a mixed display. The PDF should state the units explicitly so the spec and the submittal agree, because a reviewer who reads the wrong column specifies the wrong fan. The tool removes the hand-plotting error but not the unit error, and stating the system clearly is the small discipline that keeps the fast answer correct when it reaches the drawings.
Keruite engineers respond to selection enquiries within 24 hours, backed by the factory's own performance testing laboratory and more than 30 years of fan manufacturing experience.