Month: July 2026

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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Elevator ventilation fan, cross-flow type, for a passenger cabin ceiling
By longwell / July 14, 2026 / Engineering Case Studies

Ventilating an Elevator Cabin Without Creating a Draught

Passengers stand within a meter of the outlet. That single fact rules ...

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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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High pressure axial fan, 200mm EC, IP55 rated for cabinet cooling
By longwell / July 14, 2026 / Engineering Case Studies

395 Pa From an Axial Fan, and Why We Did Not Use a Blower

A centrifugal blower makes that pressure easily. It also turns the air...

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BESS cooling fan, 280mm EC backward curved, IP55 rated
By longwell / July 13, 2026 / Engineering Case Studies

1442 Pa for a Battery Cabinet: Why 280mm and Not 250mm

They wanted the smaller fan. Thirty millimetres of impeller diameter w...

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Heat exchanger cooling fan, 24V DC cross-flow type for enclosures
By longwell / July 10, 2026 / Engineering Case Studies

Cooling a Rectangular Heat Exchanger Without Hot Spots

A cone of air onto a rectangle leaves cold corners and a hot middle. M...

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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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Centrifugal fan carrying an IP44 fan IP rating for an air handler
By longwell / July 10, 2026 / Engineering Case Studies

The Customer Asked for IP55. They Needed IP44.

Quoting IP55 would have been easier and more profitable. One question ...

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Native 48V DC fan, cross-flow type, for a power conversion cabinet
By longwell / July 10, 2026 / Engineering Case Studies

Rewinding a Fan for 48V Instead of Adding a Converter

A DC-DC converter would have taken a week. Rewinding the motor took lo...

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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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