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.

How-to-Seal-Ducts---Cut-Leakag
By longwell / August 24, 2026 / Fan Engineering Guides

How to Seal Ducts & Cut Leakage

Duct sealing begins by identifying function, not by choosing tape or m...

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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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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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Cross-flow vs axial comparison: a tangential fan cooling a wide surface
By longwell / July 30, 2026 / Engineering Case Studies

A Wide Surface Needs a Ribbon of Air, Not a Circle

Three fan geometries were candidates. Two failed for reasons that had ...

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A 900mm axial fan re-engineered for 50 Hz to 60 Hz grid conversion
By longwell / July 29, 2026 / Engineering Case Studies

Moving a 900mm Fan From 50 Hz to 60 Hz Is Not a Sticker Change

The customer wanted their proven 50 Hz fan for a 60 Hz market. The imp...

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EC condenser fan entering fan standby mode below the 1.2V threshold
By longwell / July 27, 2026 / Engineering Case Studies

Below 1.2 Volts, This Fan Deliberately Stops

Everyone specifies the top of the control range. The bottom of it — wh...

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