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.

longwell-wi-6955633003-project
By longwell / April 13, 2026 / Engineering Case Studies

Cooling at High Altitude: Specifying a 450mm RS485 EC Axial Fan

See how we solved strict altitude and noise limits by specifying a 450...

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longwell-wi-6955538318-project
By longwell / April 13, 2026 / Engineering Case Studies

Wide-Span HVAC: 1100mm Metal Cross Flow Impeller

Learn how we engineered a custom metal cross flow impeller. It spans 1...

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longwell-lwcd-30150ln-06-proje
By longwell / April 13, 2026 / Engineering Case Studies

Cooling Low-Profile Enclosures: 30mm 2-Wire DC Cross Flow Fan

Discover how we modified a standard 30mm DC cross flow fan for a stric...

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longwell-lwca-3090sn-07-spec-s
By longwell / April 11, 2026 / Engineering Case Studies

230V AC Blower for 50mm Spaces

See how we designed a 230V compact cross flow fan to fit a 50mm space....

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longwell-wi-6954668902-project
By longwell / April 11, 2026 / Engineering Case Studies

Specifying a 24V 300mm Axial Fan for Mobile Equipment

See how we specified a 24V 300mm axial fan with 0-10V control and PA6+...

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longwell-lw2190-64-project-ima
By longwell / April 11, 2026 / Engineering Case Studies

Replacing a 110mm 24V DC Centrifugal Fan in a Compact Enclosure

See how we replaced a legacy 110mm 24V DC centrifugal fan, lowering th...

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longwell-lwae3g450ss-5mnw-03-p
By longwell / April 11, 2026 / Engineering Case Studies

Commercial HVAC Cooling: 450mm and 250mm Fan Upgrades

Learn how a custom EC axial fan solved a tough HVAC cooling problem. W...

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longwell-lwad20060-project-ima
By longwell / April 11, 2026 / Engineering Case Studies

200mm 48V DC Fan Moving 1100 CFM

See how we engineered a 200mm 48v dc fan to move 1100 CFM at 5800 RPM....

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longwell-lwea150-spec-sheet-02
By longwell / April 10, 2026 / Engineering Case Studies

Adapting a Circular Window Ventilator to 2000 RPM on 60Hz

Learn how we built a 5000-unit batch of 220V 60Hz circular window vent...

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longwell-wi-6954170590-project
By longwell / April 10, 2026 / Engineering Case Studies

Replacing a Broken Plastic Rotor for 30 m/s Industrial Air

Learn how an aluminum cross flow impeller solved big balance problems ...

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