Day: June 10, 2026

A 250mm condenser fan showing its fan airflow direction marking
By longwell / June 10, 2026 / Engineering Case Studies

The Customer Asked for the Wrong Airflow Direction

The customer asked for a blowing fan and attached a drawing to prove i...

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AC cross-flow fan with rotated motor mount for a low-profile fan coil unit
By longwell / June 10, 2026 / Engineering Case Studies

AC Cross-Flow Fan for HVAC OEM: Custom Motor Mount Case Study

The fan was right, the airflow was right, and the wires came out in th...

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backward curved centrifugal fan
By longwell / June 10, 2026 / Technical Articles

What is a Backward Curved Centrifugal Fan?

Among the various fan technologies available, centrifugal fans generat...

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24V DC centrifugal blower, double inlet, for a high-performance fan coil unit
By longwell / June 10, 2026 / Engineering Case Studies

24V DC Centrifugal Blower for Fan Coil Units: 1237 m3/h

A -40C to +85C rating on an indoor fan looks like overkill until you n...

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A 48V cross-flow fan family sharing one fan speed ceiling
By longwell / June 10, 2026 / Engineering Case Studies

Three Lengths, One Motor: Where to Stop the Speed

Three lengths, one motor family, one supply voltage. The interesting d...

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Cross-flow impeller shaft changed to 6 by 25mm for an OEM motor
By longwell / June 10, 2026 / Engineering Case Studies

Cross-Flow Impeller Shaft Change: 8×22 to 6x25mm Case Study

The impeller was right and the motor was right. The shafts were two mi...

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A 710mm competitor fan replacement for an industrial condenser
By longwell / June 10, 2026 / Engineering Case Studies

They Sent a Competitor Curve. That Tells You What They Want.

The customer sent a competitor P-Q curve and a duty point. That combin...

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EC centrifugal fan, forward-curved, upgraded to 1380 m3/h in the same housing
By longwell / June 10, 2026 / Engineering Case Studies

High-Airflow EC Centrifugal Fan Upgrade: 1380 m3/h Case Study

More airflow from the same hole in the sheet metal. That constraint is...

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