Author: longwell

What-happened
By longwell / September 22, 2026 / Technical Articles

China’s 2026 Fan Efficiency Draft: From GB 19761-2020 to FMEG – An OEM Buyer Checklist

On 20 July 2026, China's National Standardization Administration opene...

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How a Centrifugal Fan Works (Animation + Real Teardown)
By longwell / September 21, 2026 / Fan Engineering Guides

How a Centrifugal Fan Works (Animation + Real Teardown)

See the complete energy path inside a centrifugal fan: axial inlet, ra...

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How a Cross-Flow (Tangential) Fan Works
By longwell / September 21, 2026 / Fan Engineering Guides

How a Cross-Flow (Tangential) Fan Works

A cross-flow fan uses a long cylindrical impeller, an eccentric intern...

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Backward-Curved vs Forward-Curved Impeller — What's Inside
By longwell / September 21, 2026 / Fan Engineering Guides

Backward-Curved vs Forward-Curved Impeller — What’s Inside

Forward-curved and backward-curved centrifugal fans can share a diamet...

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What Is an EC Fan? Brushless DC Motor Explained
By longwell / September 21, 2026 / Fan Engineering Guides

What Is an EC Fan? Brushless DC Motor Explained

What does EC actually mean in an EC fan? This engineering explainer fo...

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Axial vs Centrifugal — Airflow & Pressure Basics
By longwell / September 21, 2026 / Fan Engineering Guides

Axial vs Centrifugal — Airflow & Pressure Basics

Should you choose an axial fan or a centrifugal fan? This engineering ...

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What Is Static Pressure in Fans? (Simple Explanation)
By longwell / September 21, 2026 / Fan Engineering Guides

What Is Static Pressure in Fans? (Simple Explanation)

Why does a fan deliver less airflow after a filter and duct are connec...

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Axial-Cooling-Fan-for-Condenser-Units--
By longwell / September 21, 2026 / Technical Articles

Axial Cooling Fan for Condenser Units: Selection Guide

A complete HVAC system usually consists of multiple components, includ...

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Fan Laws (Affinity Laws) Explained with Examples
By longwell / September 20, 2026 / Fan Engineering Guides

Fan Laws (Affinity Laws) Explained with Examples

What happens when fan speed changes from 1500 to 1200 RPM? This engine...

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What Is a Fan Wall / FanGrid?
By longwell / September 20, 2026 / Fan Engineering Guides

What Is a Fan Wall / FanGrid?

What is a fan wall, and when does a FanGrid become an engineered air-m...

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