Author: longwell

Impeller reverse engineering of a 300mm 8-blade metal axial wheel
By longwell / July 18, 2026 / Engineering Case Studies

The Last Supplier Measured It With Calipers

They had tried this before with another supplier and got a drawing bac...

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LONGWELL EC motors
By longwell / July 18, 2026 / Technical Articles

EC Motor Efficiency Explained for HVAC Systems

Electric motors served as the driving components of HVAC systems. Thei...

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LWEA2E250SM-082
By longwell / July 17, 2026 / Engineering Case Studies

LWEA2E250SM-082 220V AC Axial Fan for Enclosure Ventilation

An OEM required a 220V AC axial fan delivering 1627 m³/h with document...

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centrifugal fan maintenance
By longwell / July 17, 2026 / Technical Articles

Centrifugal Fan Maintenance: Annual Inspection Checklist & Tips

Centrifugal fans serve as the heart of ventilation systems, providing ...

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LWAA6D630S-5MYB-04-11
By longwell / July 16, 2026 / Engineering Case Studies

LWAA6D630S-5MYB-04-11 AC Axial Fan For Transformer Radiator Cooling

Case study on a 630mm AC axial fan delivering 10,000 m³/h at 60 Pa for...

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LONGWELL centrifugal fan
By longwell / July 15, 2026 / Technical Articles

Types of Centrifugal Fan Impellers Explained

In HVAC and industrial ventilation systems, centrifugal fans are widel...

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LWBE3G450-188NT-21-00
By longwell / July 15, 2026 / Engineering Case Studies

LWBE3G450-188NT-21-00 EC Centrifugal Fan for AHUs

An OEM required a high-pressure EC centrifugal fan for a new AHU desig...

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erp 2026 fan compliance
By longwell / July 14, 2026 / Technical Articles

ErP 2026 Fan Compliance Guide for EU HVAC Buyers: New Efficiency Requirements & Compliance

The European Union is implementing a more tightening regulation for in...

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Cross-flow fan under fan quality inspection against drawing criteria
By longwell / July 10, 2026 / Engineering Case Studies

No Rust, No Burrs, No Gaps: the Drawing Said So

Most drawings specify what the fan does. This one also specified what ...

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metal duct fan vs plastic
By longwell / July 10, 2026 / Technical Articles

Metal vs Plastic Duct Fan: Which is Better for Industrial Use?

In industrial ventilation systems, ducts are usually quite long, and s...

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