Fan Datasheets

Model-level technical releases: dimensions, airflow and pressure ratings, speed, electrical data and curves for LONGWELL fan platforms. Use these datasheet posts to shortlist models before requesting full selection support against your duty point.

Fan motor nameplate showing voltage, current and insulation class
By longwell / September 8, 2026 / Fan Engineering Guides

How to Read a Fan / Motor Nameplate

A nameplate contains everything you need to order a replacement and di...

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Buyer checking a batch before agreeing to buy industrial fans from a factory
By longwell / September 7, 2026 / Fan Engineering Guides

How to Buy Industrial Fans from China Safely

Sourcing from China works well when the process is structured. Verify ...

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Engineer reading a fan datasheet and performance curve before buying
By longwell / September 7, 2026 / Fan Engineering Guides

Reading a Fan Datasheet Before You Buy

A datasheet is a sales document with engineering inside it. Knowing wh...

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Engineer measuring an obsolete fan to specify a replacement
By longwell / September 6, 2026 / Fan Engineering Guides

Replacing a Discontinued / Obsolete Fan

When the original is gone and the datasheet went with it, you have to ...

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Panel mount 250mm fan showing the axial fan blade count of five
By longwell / July 14, 2026 / Engineering Case Studies

The Customer Asked for Five Blades. The Blade Count Was Not the Point.

Four units, and a request that implied new tooling. The fix was notici...

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500mm condenser fan with steel impeller for an air-cooled condenser
By longwell / July 14, 2026 / Engineering Case Studies

A STEP File Request That Reveals the Whole Specification

The customer asked only for a 3D model. That single request told us th...

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Mirrored cross-flow fan pair, 1000mm, with left and right motors
By longwell / July 8, 2026 / Engineering Case Studies

A Mirrored Fan Is Not the Same Fan Turned Around

Two fans side by side, one motor left and one right. Turning the stand...

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One long fan spanning a 1286mm trench heater housing end to end
By longwell / July 7, 2026 / Engineering Case Studies

One Long Fan or Several Small Ones? A Trench Heater Decides

Three small fans in a row look like the flexible option. They also pro...

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30-inch commercial misting fan with an integrated 45 liter water tank
By longwell / July 6, 2026 / Engineering Case Studies

30-Inch Commercial Misting Fan with a 45L Tank: 155 m3/min

A misting fan is two products in one housing, and the interesting engi...

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Ducted axial fan showing a pipeline fan mounting configuration
By longwell / July 3, 2026 / Engineering Case Studies

We Found an Error in Our Own Datasheet: 286 Pa or 124 Pa

Two of our documents disagreed. The customer would have designed aroun...

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