Month: August 2026

Steel-bladed pipeline axial fan chosen to avoid polymer embrittlement
By longwell / August 7, 2026 / Engineering Case Studies

Minus Thirty Is Where Plastic Impellers Stop Being an Option

We started with a plastic impeller to save weight. One line in the spe...

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Obsolete fan replacement matched to a legacy centrifuge condenser unit
By longwell / August 6, 2026 / Engineering Case Studies

The Original Maker Is Gone. The Fan Still Has to Fit.

A seven-watt fan holds a production line hostage: the old part is fadi...

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longwell duct fan with speed contoller
By longwell / August 6, 2026 / Technical Articles

Duct Fan with Speed Controller: How Variable Speed Improves Efficiency?

Traditional duct fans always operate at full speed, which results in u...

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Control cabinet cooling fan sized for 824 m3/h against packed drives
By longwell / August 5, 2026 / Engineering Case Studies

A Cabinet Full of Drives Is Not Free Air

The airflow number on the datasheet assumes nothing is in the way. Ins...

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duct fan vs exhaust fan
By longwell / August 5, 2026 / Technical Articles

Duct Fan vs Exhaust Fan: What are the Differences?

Effective ventilation is essential for maintain indoor air quality, co...

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Draft inducer fan built for the flue gas of a biomass pellet boiler
By longwell / August 5, 2026 / Engineering Case Studies

The Fan That Lives in the Flue Gas

The customer did not come with a wish list. They came with a failure h...

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EC axial fan with fan tachometer output for rack RPM monitoring
By longwell / August 5, 2026 / Engineering Case Studies

The Fan That Reports Its Own Speed

Most fans are trusted rather than checked. This customer wanted the fa...

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Matched 185mm axial fans in a push-pull fan configuration
By longwell / August 4, 2026 / Engineering Case Studies

One Fan Pushes, the Other Pulls

The customer ordered the same fan twice — once sucking, once blowing. ...

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Two 250mm centrifugal fans built for different fan static pressure duties
By longwell / August 3, 2026 / Engineering Case Studies

750 Pascals and 220 Pascals Are Different Fans

Same diameter, same voltage, same enclosure. The two fans share everyt...

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FCU blower on a fan overspeed test rig at 2200 RPM
By longwell / August 3, 2026 / Engineering Case Studies

Run It at 2200 RPM for Eight Hours Before You Trust It

The blowers will never see 2200 RPM in service. The customer required ...

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