Day: September 20, 2026

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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Impeller Blade Types Compared (Radial/FC/BC/Airfoil)
By longwell / September 20, 2026 / Fan Engineering Guides

Impeller Blade Types Compared (Radial/FC/BC/Airfoil)

How do radial, forward-curved, backward-curved and airfoil centrifugal...

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CFM Explained: How Much Airflow Do You Really Need?
By longwell / September 20, 2026 / Fan Engineering Guides

CFM Explained: How Much Airflow Do You Really Need?

CFM measures volume flow, but a CFM number alone cannot tell you wheth...

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How a Squirrel Cage Blower Works
By longwell / September 20, 2026 / Fan Engineering Guides

How a Squirrel Cage Blower Works

A squirrel-cage blower does not move air straight through the wheel. T...

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Total vs Static vs Velocity Pressure (Fan Curves 101)
By longwell / September 20, 2026 / Fan Engineering Guides

Total vs Static vs Velocity Pressure (Fan Curves 101)

Why can two fan curves show the same airflow but different pressure? T...

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What Is Fan Efficiency (FEI) and Why It Matters
By longwell / September 20, 2026 / Fan Engineering Guides

What Is Fan Efficiency (FEI) and Why It Matters

An FEI of 1.25 does not mean 125% efficiency. This engineering walkthr...

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Blower vs Fan — What's the Difference?
By longwell / September 20, 2026 / Fan Engineering Guides

Blower vs Fan — What’s the Difference?

Fan, blower, and compressor are not separated by one universal pressur...

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EC vs AC Motor Fans: Energy Savings & Payback
By longwell / September 20, 2026 / Fan Engineering Guides

EC vs AC Motor Fans: Energy Savings & Payback

An EC fan can save energy compared with an AC fan—but there is no hone...

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Forward-curved and backward-curved centrifugal wheels ready for selection
By longwell / September 20, 2026 / Fan Engineering Guides

Backward-Curved vs Forward-Curved: Which to Choose

Both wheels turn in a scroll and both move air outward, yet they suit ...

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