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.

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By longwell / April 14, 2026 / Engineering Case Studies

Converting a 230V System to a 380V 450mm EC Axial Fan

First, learn how we upgraded a 450mm EC axial fan to a 380V three-phas...

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longwell-wi-6957113361-project
By longwell / April 14, 2026 / Engineering Case Studies

24V Heated Blower Design for an 8.93 Cubic Feet Enclosure

Read the engineering logic behind pairing a 24V DC cross flow fan with...

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longwell-wi-6957166748-project
By longwell / April 14, 2026 / Engineering Case Studies

15000 m3/h Fan for Cement Filter Systems

We engineered an 18.5 kW industrial centrifugal fan for a cement plant...

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longwell-wi-6957086205-project
By longwell / April 14, 2026 / Engineering Case Studies

1000 m3/h Cross Flow Cooling Fan for 800 kVA Transformers

See how a 50W cross flow cooling fan delivers 1000 m3/h. It safely coo...

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longwell-wi-6957173679-project
By longwell / April 14, 2026 / Engineering Case Studies

150mm Wide Voltage DC Fan for Window Ventilation

A customer needed a wide voltage dc fan for home windows. Read how we ...

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longwell-lwae3g400st-5mew-08-p
By longwell / April 13, 2026 / Engineering Case Studies

Cooling a Data Center with a 400mm EC Axial Fan

Learn how we matched thermal loads and met strict 69 dB(A) noise limit...

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longwell-wi-6956337739-project
By longwell / April 13, 2026 / Engineering Case Studies

High-Volume HVAC Part Isolation and Torque Specifications

Learn how we engineered a custom rubber fan motor hub to handle 1000 N...

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longwell-wi-6955886227-project
By longwell / April 13, 2026 / Engineering Case Studies

Air Curtain 45×310 mm Metal Cross Flow Impeller

Learn how we engineered a 45x310 metal cross flow impeller by defining...

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longwell-lwad8025lx-29-project
By longwell / April 13, 2026 / Engineering Case Studies

Upgrading a 12V Hardware System for Higher Airflow (42 CFM)

See how we engineered a replacement 8025 DC cooling fan to deliver 42....

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longwell-wi-6955506439-project
By longwell / April 13, 2026 / Engineering Case Studies

Specifying a Drop-In 100x685mm Replacement Impeller

See how we built a replacement metal cross flow impeller for a 100x685...

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