Day: July 30, 2026

AC axial fan qualified for vertical and horizontal fan mounting orientation
By longwell / July 30, 2026 / Engineering Case Studies

Shaft Up, Shaft Sideways: the Fan Has to Survive Both

Most specifications never mention which way the fan will point. This o...

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EC fan wiring interface with power, control and feedback leads
By longwell / July 30, 2026 / Engineering Case Studies

Eight Wires, and Every One of Them Specified

The airflow requirement took one line. The wiring specification took a...

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LONGWELL top 5 bathroom exhaust fan
By longwell / July 30, 2026 / Technical Articles

Top 5 Exhaust Fans for Bathrooms in 2026: Quiet & Energy Efficient

The bathroom is usually damp and hot, especially those without windows...

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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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