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-6954277020-project
By longwell / April 10, 2026 / Engineering Case Studies

A 1.5kW Push Pull Exhaust Fan for Wet Evaporative Cooling

Learn why a 1.5kW push pull exhaust fan handles high static pressure f...

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longwell-wi-6953709623-project
By longwell / April 10, 2026 / Engineering Case Studies

200mm 115V 60Hz Axial Fan for 30 Pa Duty Points

Review the engineering details of a custom 115V 60Hz axial fan. This 2...

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longwell-wi-6953642920-project
By longwell / April 10, 2026 / Engineering Case Studies

Reversible 900mm Axial Fan: 24,000 m³/h HVAC Replacement

Read how we engineered a reversible 900mm axial fan to replace a 14-bl...

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longwell-lwcd-30530mn-06-proje
By longwell / April 10, 2026 / Engineering Case Studies

24V Cooling: Custom 30mm Cross Flow Blower for Tight Spaces

See how our team built a custom 24V 30mm cross flow blower. It meets s...

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longwell-wi-6952895469-project
By longwell / April 9, 2026 / Engineering Case Studies

Drop-In Replacement for a 230V Double Inlet Centrifugal Blower

Learn how we engineered a custom double inlet centrifugal blower to re...

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longwell-wi-6952645907-project
By longwell / April 9, 2026 / Engineering Case Studies

HVAC Ventilation 230V 125mm Circular Duct Fan

Learn why this 125mm circular duct fan drops to 294 m3/h and uses an I...

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longwell-lwbe3g225-092ps-04-pr
By longwell / April 9, 2026 / Engineering Case Studies

Custom Centrifugal Fan Mounting Hardware for HVAC Units

We changed the centrifugal fan mounting hardware to male-female stando...

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longwell-wi-6948623418-project
By longwell / April 8, 2026 / Engineering Case Studies

Commercial Air Curtain Blower Wheel for Wide Spans

An OEM needed a rigid air curtain blower wheel to span 873 mm. We used...

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longwell-wi-6948627599-project
By longwell / April 8, 2026 / Engineering Case Studies

A 500mm EC Exhaust Fan Retrofit That Drops Power to 200W

Review a real ec exhaust fan retrofit for a 24/7 production line. See ...

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longwell-lwaa2e200s-7mkw-28-pr
By longwell / April 3, 2026 / Engineering Case Studies

Designing a 60Hz AC Axial Fan for -30C Outdoor Cabinets

Learn how we engineered a custom 60hz ac axial fan with cold-rolled st...

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