Fan Efficiency

Fan efficiency should be judged wire-to-air — from electrical input to useful air power — not from motor nameplate alone. Articles cover FEI metrics, part-load behaviour, annual energy calculation and the design factors separating premium EC platforms from commodity fans.

Meeting fan efficiency regulations editorial routing
By longwell / August 21, 2026 / Fan Engineering Guides

Meeting Fan Efficiency Regulations (ErP/DOE/FEI)

Route each fan model through current market scope, test, representatio...

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longwell-lwca-30290sn-07-proje
By longwell / August 20, 2026 / Engineering Case Studies

Repositioning the Motor on a 230V AC Cooling Unit

We turned the AC motor on a 30mm cross flow blower to clear a tight ch...

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longwell-lwa-600-project-image
By longwell / August 19, 2026 / Engineering Case Studies

Factory Cooling Requirements: 10,000 m3/h 24 Inch Industrial Drum Fan

Learn the engineering behind a 24 inch industrial drum fan. See how pu...

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By longwell / August 17, 2026 / Engineering Case Studies

24V PWM Blower: 365 m3/h Cooling in a 760x80mm Profile

Learn how we engineered a 24V DC cross flow fan with custom PWM speed ...

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IE1 vs IE2 vs IE3 vs IE4 vs IE5
By longwell / August 14, 2026 / Technical Articles

IE Motor Efficiency: IE1 vs IE2 vs IE3 vs IE4 vs IE5 Compared

One of the most important measurement for electric motor is its effici...

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longwell-wi-7073135475-project
By longwell / August 13, 2026 / Engineering Case Studies

Engineering 3 Sizes of Industrial Floor Fans

We designed three new industrial floor fans. Read how we balanced size...

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A 450mm axial fan sized for low fan power consumption at 3,899 m3/h
By longwell / August 10, 2026 / Engineering Case Studies

A 138 Watt Ceiling Designed This Whole Fan

The airflow figure looks like the hard requirement. The power cap is w...

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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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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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