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 3, 2026 / Engineering Case Studies

Sizing a Commercial Roof Exhaust Fan for Facility Airflow

Learn how to size a commercial roof exhaust fan. We match big centrifu...

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By longwell / April 2, 2026 / Engineering Case Studies

125mm EC Mixed Flow Fan Engineered for 100 Pa Pressure

Discover how we built an ec mixed flow fan to hit 150 m3/h at 100 Pa. ...

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By longwell / April 2, 2026 / Technical Articles

Engineering HVAC Fan Efficiency: A Technical Guide to System Design and Selection

Engineering HVAC Fan Efficiency: A Technical Guide to System Design an...

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By longwell / April 1, 2026 / Engineering Case Studies

115V AC Centrifugal Fan with 190mm and 225mm Round Capacitors

See how we engineered a 115v ac centrifugal fan with custom round capa...

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By longwell / April 1, 2026 / Engineering Case Studies

Metal EC Centrifugal Fan for 1730 m3/h HVAC Delivery

See how we balanced 1730 m3/h of airflow against a strict 63 dB(A) noi...

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longwell-wi-6935125311-project
By longwell / April 1, 2026 / Engineering Case Studies

Engineering a 1585mm Replacement Impeller for a Dry Cooler

See the exact specs for replacing a 1585mm dry cooler fan impeller on ...

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By longwell / April 1, 2026 / Engineering Case Studies

A Split AC Indoor Fan Engineered for 61C Extreme Cooling

Review the engineering steps behind this split ac indoor fan project, ...

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longwell-wi-6930756647-project
By longwell / March 30, 2026 / Engineering Case Studies

Specifying a Radial Ceiling Pipeline Fan for Exhaust

Engineering a custom ceiling pipeline fan with a radial impeller. See ...

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By longwell / March 30, 2026 / Engineering Case Studies

220V 30 Inch Pedestal Mist Fan Design Constraints and Output

Review the engineering parameters for a 350W 30 inch pedestal mist fan...

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By longwell / March 30, 2026 / Engineering Case Studies

Converting a 230V 300mm EC Fan from Blowing to Suction

Review an engineering project where we converted a 230v 300mm ec fan f...

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