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-lwaa17050sm-11-projec
By longwell / March 30, 2026 / Engineering Case Studies

Hardware Rack Retrofit: Sizing a 172mm AC Cooling Fan

This 172mm ac cooling fan project delivers 178 CFM at 230V. Discover w...

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longwell-wi-6930422215-project
By longwell / March 30, 2026 / Engineering Case Studies

Specifying a Mirrored 160mm Centrifugal Impeller for AHUs

See how we adapted a 160mm centrifugal impeller to fit a dual-shaft mo...

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longwell-lwge148s-02-project-i
By longwell / March 30, 2026 / Engineering Case Studies

230V High Static Pressure Blower: 3500 Pa Compact Unit

Read how we engineered a custom 230V high static pressure blower to de...

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longwell-wi-6930157027-project
By longwell / March 28, 2026 / Engineering Case Studies

220V Inline Duct Fan Design for European Standards

See how we engineered a 220v inline duct fan series meeting CE standar...

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longwell-lwe-91294sa-01-projec
By longwell / March 28, 2026 / Engineering Case Studies

220V Elevator Cross Flow Fan: Cabin Ventilation Engineering

See how we engineered this 220V elevator cross flow fan to push 250 m3...

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longwell-lwad6025mm-11-project
By longwell / March 28, 2026 / Engineering Case Studies

60mm DC Cooling Fan for a 60 x 25mm Enclosure Opening

Review the exact engineering trade-offs behind a 24V 60mm dc cooling f...

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By longwell / March 27, 2026 / Engineering Case Studies

Converting a Backward Centrifugal Fan to 115V

Read how we converted a 230V design into a 115v backward centrifugal f...

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longwell-wi-6929422158-project
By longwell / March 27, 2026 / Engineering Case Studies

310V DC Cooling Fan: Meeting the 50 Pa Airflow Constraint

Read how we balanced speed, noise, and static pressure to design a cus...

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longwell-lwfe3g140-072ns-01-00
By longwell / March 27, 2026 / Engineering Case Studies

140mm EC Forward Centrifugal Fan in a 73.8mm Enclosure

Learn how we engineered a 140mm ec forward centrifugal fan to meet a s...

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longwell-wi-6929203446-project
By longwell / March 27, 2026 / Engineering Case Studies

Engineering a Custom 780mm Plastic Impeller for 24V DC Systems

Read how we built a 780mm plastic impeller using AS+GF30% material. Th...

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