Day: July 8, 2026

Rooftop condenser fan, 350mm steel impeller, rated IP44
By longwell / July 8, 2026 / Engineering Case Studies

A Rooftop Condenser Fan Held to 58 dB(A) on a Fixed Diameter

The diameter was fixed and the noise limit was fixed. Everything inter...

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LONGWELL greenhouse ventilation fan
By longwell / July 8, 2026 / Technical Articles

How to Choose Greenhouse Ventilation Fan?

In modern facility agriculture, the stability of the greenhouse enviro...

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Control cabinet cooling fan, 24V cross-flow with PWM speed control
By longwell / July 8, 2026 / Engineering Case Studies

Nine Watts to Cool a Control Cabinet: Sizing for the Job

No custom development, no compromise. Sometimes the interesting part o...

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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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Cross-flow fan showing the effect of fan supply voltage on current draw
By longwell / July 8, 2026 / Engineering Case Studies

12V or 24V for the Same Airflow: 1.9A Against 0.8A

Same fan, same 429 m3/h, same 42 Pa. Change the supply voltage and the...

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