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.

How-to-Seal-Ducts---Cut-Leakag
By longwell / August 24, 2026 / Fan Engineering Guides

How to Seal Ducts & Cut Leakage

Duct sealing begins by identifying function, not by choosing tape or m...

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IE1 vs IE2 vs IE3 vs IE4 vs IE5
By longwell / August 14, 2026 / News

IE Motor Efficiency: IE1 vs IE2 vs IE3 vs IE4 vs IE5 Compared

One of the most important measurement for electric motor is its effici...

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longwell duct fan with speed contoller
By longwell / August 6, 2026 / News

Duct Fan with Speed Controller: How Variable Speed Improves Efficiency?

Traditional duct fans always operate at full speed, which results in u...

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EC condenser fan entering fan standby mode below the 1.2V threshold
By longwell / July 27, 2026 / Engineering Cases

Below 1.2 Volts, This Fan Deliberately Stops

Everyone specifies the top of the control range. The bottom of it — wh...

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LONGWELL EC motors
By longwell / July 18, 2026 / News

EC Motor Efficiency Explained for HVAC Systems

Electric motors served as the driving components of HVAC systems. Thei...

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erp 2026 fan compliance
By longwell / July 14, 2026 / News

ErP 2026 Fan Compliance Guide for EU HVAC Buyers: New Efficiency Requirements & Compliance

The European Union is implementing a more tightening regulation for in...

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Longwell centrifugal fan
By longwell / June 17, 2026 / News

How to Improve Centrifugal Fan Efficiency? 5 Optimization Strategies

Efficient airflow is the lifeblood of modern industrial and commercial...

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best fan type
By longwell / May 21, 2026 / News

Best Fan Types for Ventilation Systems

Ventilation systems play a vital role in maintaining air quality, regu...

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ec fans in hvac ventilation
By longwell / May 13, 2026 / News

EC Fans in HVAC Ventilation: Driving the Future of Energy-Efficient Airflow

In today’s fast developing pace, efficiency is paramount in every indu...

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EC axial fan meeting fan efficiency regulations for European deployment
By longwell / May 11, 2026 / Engineering Cases

The Regulation Chose the Motor Before We Did

We usually explain why EC beat AC on the merits. In this order, the la...

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