Engineering Case Studies

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

LWAA4E550S-5MEB-02 axial fan
By longwell / July 27, 2026 / Engineering Case Studies

LWAA4E550S-5MEB-02 AC Axial Fan for HVAC Condensers

Case study on an 8,755 m³/h AC axial fan for HVAC condenser units. See...

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LONGWELL AC axial fan
By longwell / July 25, 2026 / Engineering Case Studies

LWAA4E250S-5MYB-32-00 and LWAA4E300S-5MYB-15-00 AC Axial Fan for OEM Ventilation

An OEM required a modification of standard AC axial fans into a tube-a...

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By longwell / July 25, 2026 / Engineering Case Studies

The Fan Sits Millimetres From a 1000-Watt Heater

Buy a fan and a heater separately and someone still owns the gap betwe...

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Fan filter kit adapting a 120mm axial fan to a 150mm cabinet cutout
By longwell / July 25, 2026 / Engineering Case Studies

The Cutout Is the Requirement, Not the Fan

The customer asked for a 150mm fan that barely exists. What their cabi...

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LWBA for AHU cases
By longwell / July 25, 2026 / Engineering Case Studies

380V AC Centrifugal Fan for AHUs: 695 Pa High-Pressure

Developing a standardized 380V AC backward curved centrifugal fan for ...

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Buying injection mold tooling: the 406mm axial fan blade it produces
By longwell / July 25, 2026 / Engineering Case Studies

When the Customer Wants to Buy the Tooling, Not the Parts

They did not want the parts. They wanted the mold, so they could make ...

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Single-phase axial condenser fan with a 3 microfarad run capacitor
By longwell / July 25, 2026 / Engineering Case Studies

The 3 Microfarad Number on a Condenser Fan Drawing

A drawing request for a condenser fan. The line worth reading twice is...

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A 350mm EC axial fan spec sheet for a blowing-configuration condenser variant
By longwell / July 24, 2026 / Engineering Case Studies

The Fan Already Existed. The Spec Sheet Did Not.

The customer was not asking us to design anything. They were asking fo...

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AC axial cabinet fan with a Class F motor insulation class rating
By longwell / July 23, 2026 / Engineering Case Studies

Class F on a Fan That Never Sees 155 Degrees

Class F is rated to 155 degrees. The cabinet never gets near that. So ...

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A 500mm AC axial condenser fan selected by motor pole count
By longwell / July 23, 2026 / Engineering Case Studies

Two Poles, Four Poles, Six: the Choice Was Really About Noise

You do not really choose a fan speed on an AC motor. You choose a pole...

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