Day: July 10, 2026

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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