Engineering Case Studies

Application requirements, product choices and engineering project stories from LONGWELL.

Cross-flow vs axial comparison: a tangential fan cooling a wide surface
By longwell / July 30, 2026 / Engineering Case Studies

A Wide Surface Needs a Ribbon of Air, Not a Circle

Three fan geometries were candidates. Two failed for reasons that had ...

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A 120mm DC fan with impedance-type locked rotor protection
By longwell / July 30, 2026 / Engineering Case Studies

If the Blades Jam, the Fan Must Not Burn: 72 Hours of Proof

Every requirement in this order assumed the fan works. One requirement...

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Cross-flow fan motor built for clockwise fan rotation direction
By longwell / July 29, 2026 / Engineering Case Studies

You Cannot Just Run the Motor Backwards

The CAD integration found the motor on the wrong side of the chassis. ...

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A 900mm axial fan re-engineered for 50 Hz to 60 Hz grid conversion
By longwell / July 29, 2026 / Engineering Case Studies

Moving a 900mm Fan From 50 Hz to 60 Hz Is Not a Sticker Change

The customer wanted their proven 50 Hz fan for a 60 Hz market. The imp...

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LWPVE-1530T-01
By longwell / July 29, 2026 / Engineering Case Studies

LWPVE-1530T-01 Exhaust Fan for Large Industrial Ventilation

Longwell engineers a 1530mm industrial exhaust fan to deliver 51,000 m...

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A 200mm DC axial fan held under a 1050 gram fan weight limit
By longwell / July 28, 2026 / Engineering Case Studies

The Fan Had a Weight Limit Before It Had an Airflow Target

Airflow, pressure, noise, voltage — every order states those. This one...

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LWFE3G200-102SS-02-00
By longwell / July 27, 2026 / Engineering Case Studies

LWFE3G200-102SS-02-00 EC Centrifugal Fan for HVAC

An OEM required a 200mm EC centrifugal fan delivering 700 m³/h at 1000...

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Forward-curved blower housing from low-volume tooling, 150 units a year
By longwell / July 27, 2026 / Engineering Case Studies

A Custom Stamping Die for 150 Fans a Year

Tooling economics usually assume volume. This customer commissioned a ...

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EC condenser fan entering fan standby mode below the 1.2V threshold
By longwell / July 27, 2026 / Engineering Case Studies

Below 1.2 Volts, This Fan Deliberately Stops

Everyone specifies the top of the control range. The bottom of it — wh...

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Split impeller sections and central coupling for a 1200mm cross-flow fan
By longwell / July 27, 2026 / Engineering Case Studies

Twelve Hundred Millimetres of Airflow From Two Pieces

No single impeller extrusion survives 1200mm at speed. The customer ne...

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